Oil-free lubrication bearing, as the name implies, refers to the use of before or during the use of lubricants can also be normal operation, and play a good effect of friction reduction bearings. Oil-free lubrication bearing belongs to a kind of sliding bearing. General sliding bearings need to add lubricant, grease and other lubricants before work, so as to form a lubricating film on the friction surface and play an effective role in lubrication, while oil-free slide bearings made of self-lubricating materials or pre-filled with lubricant after sealing up can be used for a long time, without adding lubricant during the work process.

Bushing Type
Oil-free lubrication bearing from the product structure is divided into solid inlay bearing, composite bearing, oil bearing, new single lubrication material.
Solid inlay bearings
Common is the solid lubrication material graphite (black lead), polytetrafluoroethylene (PTFE), molybdenum disulfide, etc. using the inlay process buried in high force brass, tin bronze, aluminum bronze, cast iron or GCr15 and other alloy materials. It breaks through the limitations of general sliding bearings relying on oil film lubrication. In the process of use, the solid lubrication is made to rub with the shaft through frictional heat, forming the excellent condition of oil and powder coexisting lubrication, which not only protects the shaft from wear, but also makes the solid lubrication characteristics eternal. The hardness of high force brass is twice as high as the general brass bushing, and the wear resistance is twice as high, and the bearing capacity is high.
Composite Bearings
The common composite bearing is made by combining two layers of steel plate and copper powder layer (bimetal), or three layers of steel plate, copper powder layer and self-lubricating material (PTFE, PEEK, POM) + filling material. It adopts high temperature sintering process to bond the self-lubricating material on the steel plate, which not only ensures the frictional wear performance of the working surface of the product, but also ensures the structural stability and load-bearing capacity of the bearing.
Oil-bearing
Oil-containing bearings are made of metal materials, and the bearings are oiled and sealed with lubricating oil, so that they can be used without adding oil to achieve the effect of “self-lubrication”. Since the bearing contains oil lubricant, it has good lubrication and avoids oiling and maintenance work.
New Single Lubricant Bearings
New single-lubricated material bearings are common resin, ceramic, tungsten carbide bearings, etc., and new materials are constantly being developed, but these bearings may have high costs, narrow application area, etc., can not be widely promoted to replace rolling bearings.

Bearing Bushing Advantage
Oil-free lubrication or oil-less lubrication, is suitable for places where it is impossible or difficult to refuel, can be used without maintenance or less maintenance, and also eliminates the risk caused by insufficient oil supply.
No oil supply device required
No oil supply device is required, and oiling can be eliminated during operation, thus saving significant installation and operation costs. Oil-free can make the design and structure, etc. significantly simplified, reducing costs and saving design time.
Green and Environmentally Friendly
No need for waste oil recycling treatment, which is good for environmental protection.
Reduced requirements for grinding parts
The hardness requirement for grinding shafts is low, and shafts without tempering treatment can be used, thus reducing the difficulty of machining related parts.
High and low-temperature resistance
High and low-temperature resistance, some products can be used at temperatures from -200℃ to 600℃.

Applications
Engineering and construction machinery
Crank arm bushings, guide wheel bushings, oil cylinders, gear oil pumps, driven wheels, driven wheels, rotary tables, grapple joints, and other parts in excavators, bulldozers, scrapers, rotary drilling rigs, lifting machines, handlers, forklifts, and other machinery.
Plastic and rubber machinery
Injection molding machine, tire curing machine, blowing machine, molding machine, and other machinery such as crosshead, locking mold, oil cylinder, machine hinge, operating mechanism, and other parts.
Automobile parts
Transmission, differential, clutch, balance axle, connecting rod bushings, throttle body, tension wheel, turbocharger, injection pump, idler pulley, oil pump, rocker arm bushings, shock absorber, steering machine, steering resistance pump, hinge, wiper, and other parts.
Office equipment fitness equipment
Copiers, printers, fitness equipment, sewing machines and other machinery requiring transmission or reciprocating motion parts.
Mould guide bush
Parts of the mold such as guide, diagonal fit, positioning, guide rail, etc.
Food and pharmaceutical machinery
Because of the high requirements for the production environment, the rotating and reciprocating parts of food machinery and pharmaceutical machinery.

Failure mode
Abrasive particle wear
Some of the hard particles that enter the bearing gap rotate with the shaft and act as abrasive to the bearing surface.
Scratching
The hard particles entering the bearing gap or the rough microscopic contour spikes on the surface of the shaft diameter scratch the bearing surface with linear scars.
Gluing
When the transient temperature rise is too high, the load is too large, when the oil film rupture or insufficient oil supply, bearing surface material adhesion and migration occurs, causing bearing damage.
Fatigue spalling
Under the repeated action of the load, the bearing surface fatigue cracks perpendicular to the sliding direction, after the expansion of the bearing material spalling
Corrosion
Lubricant in use constantly oxidation, the acid generated on the bearing material has corrosion, material corrosion is easy to form pitting spalling. There is also cavitation fluid erosion electric erosion.
Feature Description
Oil-free lubrication or oil less lubrication is suitable for places where it is impossible or difficult to add oil and to avoid mixing of lubricating oil as well as no or less maintenance during use and also eliminates the risk caused by insufficient oil supply. No oiling device is required, no oiling device is required, no oiling is required during operation, and therefore significant installation and operating costs can be saved. Oil-free can make the design and structure greatly simplified, reducing costs and saving design time Green, no need for waste oil, recycling, and environmental protection. Reduced requirements for grinding parts, low hardness requirements for grinding shafts, untempered shafts can be used, thus reducing the difficulty of processing related parts. High and low temperature resistance, high and low temperature resistance; some products are applicable temperature -200℃ to 600℃. Application of oil-free lubrication bearings: construction machinery; excavators, bulldozers, scrapers, rotary drilling rigs, lifting machinery, conveyors, forklifts, etc. Machinery crank arm bushings, guide wheel bushings, oil cylinders, gear oil pumps, driven wheels, driven wheels, rotary tables, grapple joints and other parts. Plastic and rubber machinery: injection molding machine; tire vulcanizing machine; blowing machine; forming machine and other machinery of crosshead locking, oil cylinder? Machine hinge? Operating mechanism and other parts. Auto parts shifter, differential, clutch, balance axle linkage bushing, throttle body, tensioner wheel, turbocharger, injection pump, idler wheel, oil pump, rocker arm bushing? Shock absorber, steering machine, steering resistance pump? Hinges, wipers and other parts. Office equipment fitness equipment: copiers, printers, fitness equipment, sewing machines and other machinery that require transmission or reciprocating motion parts. Mold guide bush Mold guide, diagonal fit, positioning, guide rail and other parts of the food and pharmaceutical machinery. Because of the high requirements of the production environment: food machinery; pharmaceutical machinery rotation and reciprocating motion parts without oil lubrication bearing failure mode Abrasive wear The hard particles that enter the bearing gap some of which rotate with the shaft? Abrasive effect on the bearing surface. Scratching The hard particles entering the bearing gap or the rough surface of the shaft diameter microscopic profile spikes, in the bearing surface scratches a linear scar. Gluing when the instantaneous temperature rise is too high load is too large oil film rupture or insufficient oil supply bearing surface material adhesion and migration caused by bearing damage. Fatigue spalling in the load has to be repeatedly under the action of the bearing surface with the sliding direction of the fatigue crack expansion caused by bearing material spalling corrosion lubricant in use constantly oxidation generated by the acidic material on the bearing material has corrosion material corrosion prone to the formation of point-like spalling.