A bearing that does not require oil, specifically: a bearing in which a lubricant (such as powdered graphite) is added to the material from which the bearing is made.
self-lubricating bushings consist of metal parts with a porosity close to 25%.
High porosity means that liquids can transfer more easily. This is where self-lubricating comes into play. Depending on the requirements of the application (eg operating temperature), this lubricant can be liquid (oil) or solid (graphite, MoS2, lead).
Since they do not require lubricating oil, self-lubricating bushings are generally used, such as precision machinery that is difficult to lubricate, equipment with a poor affinity for oil, and the like.
How should oilless bushing be installed and maintained?
In general, the main technical requirement of our oilless bushing assembly is to obtain a reasonable journal and oilless bushing clearance, to ensure good contact between the journal and the sleeve bushings, and to fully lubricate the copper sleeve, so that the journal rotates smoothly and reliably in the oilless bushing.
Oilless bushing assembly:
Before assembly, first deburr the sleeve and the oilless bearing seat hole, clean and dry the oilless bush, and apply lubricating oil in the oilless bushings seat hole.
According to the size of the sleeve and the interference size when fitting, the sleeve is installed into the high quality oilless bushings seat hole and fixed by tapping or pressing.
The inner hole of the oilless bushing should be repaired and inspected by reaming or scraping to ensure a good clearance fit between the journal and the bushing.
Maintenance of oilless bushing:
The forms of damage to plain bearings include wear, melting, spalling and cracking of the working surfaces. The main reason for these defects is that the oil film is damaged for some reason, resulting in direct friction between the journal and the oilless bushings surface.
Different about oilless bushing repair methods
The repair of the integral sleeve bearings generally adopts the method of replacing the sleeve. The slight wear of the split slide bearings can be dealt with by adjusting the gasket and repairing the scratches.
When the working surfaces of the inner column and outer tapered slide bearings are not severely worn, the clearance can be adjusted with a nut, and only for precise trimming; when the working surfaces are severely worn, the main shaft should be removed and the bearings should be scraped off.
Grind again to restore its matching accuracy. When there is no adjustment margin, the spraying method can be used to increase the diameter of the outer cone surface of the sleeve bearings, or remove the small end cone surface of the oilless bushings, extend the thread length, and increase the adjustment range. When the oilless bushings is seriously deformed and worn, it must be replaced.
For multi-wafer sliding bearings, when the working surface is slightly worn, the inner surface of the aluminum bronze bushing can be polished and repaired by grinding. When the working surface is severely burned or worn by the shaft, the inner surface of the bearing can be repaired by scraping and grinding.
Features and advantages of oilless bushings
Oilless bushing is now mainly divided into two series, which are divided into oil-free bushings series and boundary lubricating bushing series.
What are the main features and advantages of oilless bushing during use? Based on the understanding of oilless bushing, Jiaerda oilless bushing shares the following features and advantages of the oilless bushing.
Oilless bushing series
Oilless bushing or self-lubricating bushings, suitable for places where it is impossible to refuel or difficult to refuel, and can be used with no or little maintenance.
Good wear resistance, small friction coefficient and long service life. It has an appropriate amount of elasticity and plasticity, which can distribute the stress on a wider contact surface and improve the bearing capacity of the bearing.
The static and dynamic friction coefficients are similar, which can eliminate crawling at low speed, thereby ensuring the working accuracy of the machine.
|Base Material Specification
|Tin bronze: ZCuSu10P1
Aluminium bronze: ZCuAl10Fe3, ZCuAl9Ni4FeMn2
Aluminium brass: ZCuZn25Al6Fe3Mn3
|Main Technical Parameters
Friction Coefficient: 0.08-0.13
Max Load: 100N/m㎡
Operating Temperature: ≤300℃
Limit Velocity: ＜oil5m/s, Grease0.4m/s
It can reduce vibration, reduce noise, prevent pollution and improve working conditions of machinery. A transfer film can be formed during the operation, which protects the grinding shaft and has no shaft bite phenomenon.
The hardness of the grinding shaft is low, and the shaft without quenching and tempering treatment can be used, thereby reducing the processing difficulty of related parts. Thin-walled structure and light weight can reduce the mechanical volume.
The back of steel can be electroplated with various metals and can be used in corrosive media; it has been widely used in sliding parts of various machinery, such as printing presses, textile machines, tobacco machinery, micro motors, automobiles, motorcycles and agricultural and forestry machinery, etc.
Boundary Oilless Bushings Series
Good load bearing and good wear resistance. It is suitable for rotating motion and swing motion under high load and low speed, and occasions where frequent opening and closing under load is not easy to form hydrodynamic lubrication.
1.Under the condition of boundary lubrication, it can be maintained without oil for a long time, and oil in the over-layer can make the oilless bushings service life longer.
2.The surface plastic layer can be left with a certain margin during processing and molding, and can be processed by itself after being assembled and pressed into the seat hole to achieve a better assembly size.
3.The products are mainly used in automobile chassis, metallurgical machinery, mining machinery, water conservancy machinery, construction machinery, agricultural machinery, steel rolling equipment, etc.
Which is better, self-lubricating copper sleeve and spherical plain bushing copper sleeve?
Inlaid self-lubricating bushings is a kind of self-lubricating metal. It is based on wear-resistant metal material. By adding various lubricating materials, the friction factor is reduced and self-lubricated is realized.
Development of Oilless bushings suppliers
With the development of industrial technology and the advancement of science and technology, the requirements for the performance and reliability of oilless bushings are getting higher and higher and more demanding, in some special and harsh working conditions.
Such as: low temperature, high temperature, vacuum, underwater, heavy load, low-speed applications etc, due to the failure of grease lubrication and the ineffective formation of lubricating oil film, the traditional rolling bushings relying on grease lubrication have been difficult to play the role of load bearing and friction reduction.
Basic materials of oilless bushings
Oilless bushings that rely on solid lubricants to lubricate can still perform excellently in such an environment. Inlaid self-lubricating metal bushing is a kind of oilless bushing. It is based on wear-resistant metal material. By adding various lubricating materials, the friction factor is reduced and self-lubricating is realized.
This materials structure combines the advantages of metal’s heavy load, good impact resistance, good chemical resistance , good material properties, good friction properties and non-metallic coefficient, and can be used in a variety of different working conditions.
Inlaid solid lubricated bearings are suitable for low speed, medium and high loads, and can maintain a very low friction coefficient under the conditions that lubricating grease cannot maintain a complete lubricating film, such as swing, reciprocating motion, and frequent start and stop.
Types of inlaid oilless bushings
Copper-based inlaid self-lubricating bushings: copper alloys inlaid self-lubricating bearings (national standard GB/T23894-2009) are the most widely used inlaid self-lubricating bushings products.
This material structure combines the advantages of high load carrying capacity, good impact resistance and non-metallic coefficient of metals and the self-lubricating properties of solid lubricants, which can meet the use of various working conditions(with metal components).
So that it does not need to be refueled and maintained during use. Products are widely used in high-load and meet industry standards, intermittent or oscillating motion, such as automobile and locomotive production lines, hydraulic turbines, industrial applications/typical applications,machine tools, textile machinery, reservoir work/accident doors, plastic machinery, ship industrial applications, etc.
Steel basic oilless bushings
Steel base inlaid oilless bushings: Steel-based inlaid oilless bushings are reinforced products with high compressive performance. They can discharge lubricating particles during operation, so that a diaphragm is formed between the shaft and the sleeve, which is more resistant to seizure than single oil lubrication.
The advantages are especially suitable for the supporting parts of lifting machinery. For example: hoist support, crane support, self lubricating properties，but not suitable for use in water or acid-base occasions.
Iron basic oilless bushings
Cast iron-based inlaid self-lubricating bushings: Cast iron/carbon steel inlaid bushing is a new industrial product manufactured by Jiaerda Bushing with HT250 as the base materials and embedded with solid lubricant.
It is a typical material-saving product. If the pressure is less than 14.5N/mm2 or the mechanical properties are required, it can be used as a substitute for JDB-2 material. It can greatly reduce the cost and meet the requirements of USA.
For example: mold guide column, injection molding machine mold base and other industrial fields can be used.
Steel basic oilless bearings
Steel-based copper alloys inlaid oilless bushings: steel-based copper alloys inlaid oilless bushings cast high-strength copper alloys on the surface of high-quality carbon steel as the basic material of the bushing.
The bonding surface achieves complete metallurgical bonding, which not only reduces the material cost, but also improves its bearing capacity; and according to the working conditions, inlaid solid lubricant on its working surface greatly reduces the friction factor of the bearing and achieves the purpose of self-lubricating.
other metals of oilless bushings
Copper alloy inlaid inner ring self-lubricated spherical plain bearing: Copper alloy inlaid inner ring self-lubricating spherical plain bearing is a space motion pair sliding bearing with self-lubricating performance that can rotate or swing in any direction.
The inner ring of the plain bearings are made of special copper alloys materials, the spherical surface of the inner ring is inlaid with solid lubricant, and the outer ring is made of bushing steel, which is phosphated or chrome-plated after heat treatment and polished.
Bimetal coiled inlaid oilless bushings; bimetallic coiled inlaid oilless bushings are coiled oilless bush produced by JEDBUSHING. The novel thin-walled solid-lubricated bushings are made.
Due to the use of high-strength load-bearing alloy materials as the matrix, the ideal filler material is wear-resistant agent, and the reasonable diamond block lubrication design, the lubrication area is more than 25%, so it can exert good lubricity and anti-wear performance.
Bimetal coiled inlaid oilless bushings are used in automobile transmission gearboxes, generators, elevators, cranes and metallurgical machinery and other industries.
Copper alloy coiled inlaid oilless bushings
JIAERDA/JEDBUSHING use specially formulated high-density copper alloy strips as the matrix, and the surface is embedded with solid lubrication.
The agent is made by multiple processes such as rolling and shaping. Since the copper alloys materials with high elongation is used as the matrix, it can be made into an ultra-thin rolled bushing, and the ideal filler material is a lubricant.
How to choose solid inlaid oillsee bushings?
In order to solve the lubrication problems of high temperature, low speed, heavy load, large dust, water shower and shock vibration in mechanical equipment, oil-free self-lubricating bearings/oilless bushings are selected.
The structure of the bearing oilless bush is to develop orderly and appropriately sized holes on the metal friction surface of the bearing base, and embed molybdenum disulfide, graphite, etc. to make a composite oilless block inlaid on the metal sleeve.
Friction of Solid lubricants
Bushings, the friction area of
However, due to its low mechanical strength and weak bearing capacity, it is easy to deform, and this defect can be suppressed by embedding it in the metal hole groove, forming the metal part to play a bearing role, and the self-lubricating block to play a lubricating role.
The lubrication mechanism of this kind of oilless bearing is that during the sliding friction between the shaft and the sleeve bearings, a part of the molecules of the self-lubricating material is transferred to the metal surface of the shaft, filling the small unevenness and forming a relatively stable solid lubricating film, causing the friction between the solid lubricating films to prevent the adhesive wear of the shaft and the sleeve.
This rational combination combines the respective complementary advantages of copper alloys and non-metallic wear-reducing materials, and is especially suitable for motion amplitudes in oil-free, high temperature, thermal expansion, high load, low speed, low aintenance costs, anti-fouling, anti-corrosion, strong radiation environments, and It is used under special working conditions where water or other solutions cannot be added at all.
The area occupied by the self-lubricating block is related to the running speed and the bearing strength. The running speed is low; the bearing strength is high, and the metal occupied area should be larger. For example, the self-lubricating block of the traveling wheel bearing of the ingot-holding trolley occupies about 25% of the area.
The shaft bearing of the ingot-pulling mechanism should be fully lubricated, and the pressure bearing strength is not large. The area of
Requirements of bushings materials
Technical requirements for bushing materials: The self-lubricating bearing bushing should be made of alloy copper or other metals. The bushing should have high hardness, and generally require heat treatment, and its hardness should not be lower than HRC45. 4. The geometry of the self-lubricating block and Mounting requirements.
The shape of the self-lubricating block is cylindrical and rectangular. The self-lubricating block can be cylindrical according to the size of the occupied area, otherw, ise it can be rectangular. Regardless of the shape, it must be set firmly to prevent it from falling off during operation.
The matching clearance between the bushing and the shaft The linear expansion coefficient of the self-lubricating block is about 10 times that of steel. In order to adapt to the temperature change of the high-quality oilless bushings, the gap between the shaft and the bushing is increased from 0.032 to 0.15MM to 0.45 to 0.5MM from the original four-stage dynamic fit of metal parts (D4/DC4).
The self-lubricating block protrudes from the bushing metal by 0.2-0.4MM on one side of the friction pair. In this way, the bearing will be fully lubricated during the initial running-in period of operation and reduce the consumption of power dragging power.
What is the self-lubricating principle of powder metallurgy oilless bushings?
The principle is the hole! The hole stores lubricating oil. When the rotating temperature of the oilless bushing increases, the viscosity of the oil decreases, and at the same time, the oil expands due to heat, seeps out from the hole, and forms an oil film for lubrication; after the rotation is stopped, the temperature decreases, the oil cools and contracts, and is sucked back into the hole by capillary action.
Another is that during the rotation of the bushings, the oil is driven into the hole from one direction, and then seeps out from the hole to the working surface from the other direction, so that the lubricating oil is continuously circulated in the shaft.
Classification of sliding bearings
The direction that can bear the load, it can be divided into two categories: radial (radial) sliding bushing and thrust (axial) sliding bushing. The type of lubricant, it can be divided into seven categories: oil-lubricated bearings, grease-lubricated bearings, water-lubricated bearings, gas bearings, solid-lubricated bearings, magnetic fluid bearings and electromagnetic bearings.
About low maintenance costs
According to the thickness of the lubricating film, it can be divided into two types: thin film lubricated bearings and thick film lubricated bearings.
The oilless bushings material, it can be divided into bronze bushings, cast iron bearings, plastic bearings, gemstone bearings, powder metallurgy bearings, self-lubricating bearings and oil-impregnated bearings.
According to the oilless bushing pad structure, it can be divided into round bearings, elliptical bearings, three-oil vane bearings, stepped surface bearings, tilting pad bearings and foil bearings.
Do bronze bushings need grease?
JEDBUSHING as manufacturer of solid bronze bushings can be lubricated with oil or grease. Lubricants not only improve sliding properties, self lubricating properties, but also reduce wear and prevent corrosion. Solid bronze bushings are usually lubricated with grease, although oil is used in special cases.
Bronze bushings require some kind of lubricant to reduce friction in almost all applications. While oils are sometimes used, grease is required for most industrial applications.
Erosion and erosion of liquids. For example, some industrial and mining enterprise critical equipment in mining environments operates under extremely harsh working conditions.
Due to the heavy equipment, high ambient temperature, large dust or acidic corrosive gases CO, SO2, etc. in the air, many problems are brought to the lubrication of the equipment, and the friction and wear are serious.
What are the characteristics of oilless bushing used in construction machinery?
Oilless bushings suppliers like us have large carrying capacity, harsh environments, large losses, good delivery times and difficulty in replacing oilless bush components. oilless bushing have the characteristics of metal bearings and sliding bearings.
The metal matrix bears the load, and the specially formulated solid lubricant plays a lubricating role. It has the characteristics of high bushing capacity, impact resistance, high-temperature resistance, strong self-lubricating ability, etc.
Users generally believe that embedded bearings not only save fuel and energy, but also have a longer service life than ordinary sliding bearings.
It is especially suitable for heavy load, low speed, reciprocating or swinging and other occasions where lubrication is difficult to form an oil film, and it is not afraid of water erosion and other acid solutions.
JED oilless bushing common types of construction machinery:
At present, oilless bushings have been widely used in metallurgical continuous casting machines, rolling equipment, mining machinery, ships, steam turbines, water turbines, injection molding machines and other large construction machinery.
- Tower cranes, self-propelled cranes, mast cranes, grab cranes and other lifting machinery.
- Excavation machinery such as single bucket excavators, multi bucket excavators, rolling excavators, milling excavators, tunnel boring machines (including shield boring machine), etc.
- Scraper transport machinery, such as bulldozers, scrapers, graders, transport vehicles, flatbed trucks and dump trucks, etc.
- Compaction machinery such as tire rollers, flat wheel rollers, single foot rollers, vibratory rollers, tamping machines, tamping machines, etc.
- Reinforced concrete machinery such as concrete mixer, concrete mixing station, concrete mixing building, concrete delivery pump, concrete mixer truck, concrete sprayer, concrete vibrator, steel processing machinery.
- Drilling machine, diesel pile driver, vibratory pile driver, pile driver and other pile driving machinery.
- Rock drills, such as rock drills, pneumatic drills, electric drills, internal combustion engine drills and down-the-hole drills.
- Other construction machinery such as bridge erection machines and air tools (air tools).
What are the classifications of oilless bushing?
Metal base solid inlaid oilless bushings:
A high-performance solid lubricant product with composite solid lubricants such as graphite embedded in a metal matrix.
It breaks through the limitation of general bearings relying on oil film lubrication.
Multilayer composite oilless bushings
The steel plate is used as the matrix, the spherical bronze powder is sintered in the middle, and the surface is rolled with a mixture of polytetrafluoroethylene (PTFE) and lead.
It is a rolling bearing. It has the characteristics of low friction coefficient, good wear resistance, good corrosion resistance and oil-free lubrication.
Oil-free bushings, Bronze wear plate, Oil-free sliding plate, oilless bushing
Non-standard parts, JED bronze bearings, Bimetal bearings, Oil-free bearings, Graphite self-lubricating friction plate, Bronze self-lubricating bearings baseed on aluminum bronze powder/brass.
Brass plate self-lubricating, JED graphite loose gold bearings, Alloy inlaid high wear-resistant bearing.