Bearings are widely used in the wind power industry

Bearings are widely used in the wind power industry and is an important component parts of wind turbines most part, wind power bearing related to the entire range of used from blades, spindles and yaw bearings used in the gearboxes and generators smaller high-speed bearings in general, bearing a wind machine in the weak parts. Particularly for gearboxes, large bearing spindle and the generator can cause major malfunction in some models of wind turbines. Currently, for wind turbines The bearings consist of spherical roller bearings, ball bearings and rotating pivot bearing components.

Analysis of wind power bearing load zones

In the operation of wind power bearing roller bearings in general bear only part of the load at the same time, and the area where this part of the roller bearing area we call the bearing. The bearing load size, the size will be running clearance for bearing zone impact. If the bearing area is too small, the roller in the actual operation is prone to slippage. For wind power gear box, if the spindle is designed with double bearing support program, then theoretically only torque is transmitted to the gearbox. In this case, through simple mechanical analysis, we find that the planet carrier supporting the bearing load is relatively small, so the bearing area of the bearing often relatively small, roller prone to slippage. In the wind turbine gearbox design carrier support bearings generally use two single row tapered roller bearings or cylindrical bearings two full programs.

wheel bearing

Traditional automotive wheel bearing by two sets of tapered roller bearings or ball bearings combination, bearing installation, oiled seals and clearance adjustment is carried out in a car production line. This structure makes it in automobile production plant assembly difficulties, high costs, poor reliability, and maintenance of the car at the service points, also need to be cleaned bearings, oiled and adjusted. Developed on the basis of the wheel bearing unit is the standard angular contact ball bearings and tapered roller bearings on
, It will be two sets of bearings as a whole, with good assembly performance, you can omit clearance adjustment, light weight, compact structure, large load capacity, can be pre-loaded to grease sealed bearings, hub wheel and external seal omitted from maintenance etc., have been widely used in cars, the truck also has a tendency to gradually expand the application.

A wide variety of lifting machinery bearings

In bridge engineering used in lifting machinery, depending on its construction and performance, and can be divided into small light lifting equipment, bridge type crane and jib type cranes, cable cranes four categories. Small light lifting equipment such as : Jacks, pneumatic hoists, electric hoists, balancing gourd (aka balance suspended), winches, etc.Bridge type crane as beam cranes, gantry cranes. Such as fixed jib type crane slewing cranes, tower cranes, truck cranes, tire cranes, crawler cranes. Cable cranes as lifts. Lifting classification by lifting TYPE: mobile cranes, tower cranes, mast crane. Form of the structure, the crane can be divided into small light lifting equipment, bridge type (bridge, gantry crane), arm shelf (self-propelled, tower, gantry, rail-style, floating boat-mast cranes), cable type. Arm erecting cranes and bridge crane features basically the same. In round ground and over the job, and more for handling and installation and other outdoor work, portal cranes, floating cranes, derricks, cranes line the walls and deck crane bearing and so on.Arm erecting cranes include: hoisting mechanism, luffing mechanism, rotation mechanism. With the action rely on these institutions can within a certain weight lifting and handling cylindrical space. Arm mounted on erecting cranes more other forms of transport on the vehicle (mobile) tool, which constitutes a running boom started rotating crane. Such as mobile cranes, rubber-tyred cranes, tower crane bearing, portal cranes, floating cranes, railway cranes.

Cylindrical Roller Bearings Structure and Properties

Cylindrical roller bearings roller line contact with the raceway, large radial load capacity, it is compared with the same size series of deep groove ball bearing have a greater radial load carrying capacity, but for the mating shaft and installation coupled with high accuracy requirements, when the center line of the outer shaft mounted tilted, causing the roller raceway contact with the surface deterioration, affecting bearing life, reduce the carrying capacity, generally the maximum allowable housing the inclination angle of 1.5 ° -3 °. Roller guided on both sides by the inner wall/outer ring, but also for high-speed rotation.

Thin wall bearing the classification

thin wall bearings for extremely thin section bearing, but also to achieve a compact, lightweight, product diversity of products has expanded its range of purposes - Thin ring bearing can be deep groove ball bearings, four point contact bearings or angular contact ball bearings, high precision such slim ball bearing, very quiet and strong carrying capacity. These ball bearings have three designs, and extremely small, mostly square cross-section. In these series, even larger shaft diameters and bearing bore, the cross-section remains unchanged, these bearings so called Cross Section.

Slewing ring

Slewing ring wide range of applications, mainly used for lifting machinery (truck cranes, offshore crane bearing, etc.), construction machinery (excavators, loaders, etc.), transport machinery, materials processing machinery, metallurgical machinery, food processing machinery, and military equipment (tanks, anti-aircraft artillery, radar, rocket launchers, etc.), medical equipment, scientific equipment. Slewing bearings and plain bearings, like all the rolling elements and rolling ring with raceways. However, it is compared with the ordinary rolling bearing, there are many differences, and they are the following:
1. slewing ring size is large, its diameter is typically 0.4 to 10 meters, some as high as 40 meters.
2. slewing bearings are generally required to bear the load of several aspects, not only to withstand axial and radial load, but also bear a large tipping torque. Therefore, often acts as a rotary bearing sets ordinary rolling bearings.
3. slewing ring operating speed is very low, usually in the 10 r / min or less. Moreover, in most cases, slewing ring without continuous rotation, but only within a certain angle and from the rotation, the equivalent of the so-called "swing bearing."
4. In the manufacturing process, materials and heat treatment, etc., slewing ring and rolling bearings are very different.
5. Generally, the sealing device with slewing ring on the ring gear rotational drive and dust with.
6. slewing ring size is large, so unlike ordinary bearing sleeve and mandrel mounted on the bearing housing, instead of using screws to fasten the upper and lower bearings.

Wind Bearing industry opportunities and risks

At present, China's wind power bearing industry has "five male guru" of the situation, the state focused on nurturing wind power with independent intellectual property rights of the manufacturer, will give subsidies to support related equipment manufacturing, research and development centers, so we Luoyang Huayang company also added wind power bearing production. However, there is general wind bearing device compatibility is not enough, versatility is not strong, except for the wind turbine support, but more limited range of applications, wind power bearing gear and worm gear reducers processing equipment can only not in port machinery, large-scale medical equipment, construction machinery, such as number use the number of mechanical products, uses a single risk exists.

Deck crane slew bearing rocking tests

A number of incidents have occurred recently involving failure of the slew bearings of ships’cargo deck cranes, resulting in crane losses and serious injury to personnel. These failures have been caused by undetected excessive wear in the slew bearings.Rocking tests deck crane bearing manufacturers generally recommend that ‘rocking tests’ are carried out every six months in accordance with their instructions, and that the results are recorded and monitored in order to ensure the wear tolerances remain within the limits permitted by the designers.Cranes which are particularly at risk are those with single ball race slew bearings. Cranes fitted with this type of slew bearing must have rocking tests carried out, in accordance with manufacturer’s instructions, to determine that the amount of wear in the bearing races is within permitted limits.

Super Precision Bearings & high precision bearings

Machine tools and other precision applications bearings need to have excellent performance. It includes an extensive speed capacity to maintain a high rotational accuracy, high system rigidity, low heat generation, low noise, low vibration, and so on. Rolling general industrial applications can only meet part of the requirements. Therefore, our company to create a full range of high precision bearings. Super precision bearings can help further optimize performance parameters of their equipment and applications OEMs and end customers. And depending on the bearing series and applications, with the advantage different, but always include high speed and carrying capacity, bearing a long service life, maintenance intervals long time, low energy consumption.
Typical applications include super precision bearings:
1.Metal cutting and woodworking machinery Spindle
2.Other mechanical spindles (such as dynamic balancing machine)
3.High speed rolling bearing machine
4.Printing Equipment
5.Precision Ball
6.Machining Center
7.High speed turbocharger
8.Vacuum pump
9.Racing
10.Ship anti-rolling gyro system
11.Mechanical Components Semiconductor Industry

The relative movement between the shaft and the bearing sliding bearings

The relative movement between the shaft and the bearing sliding bearings, linear plain bearings called. Bearing basic structure is divided into the bush and the journal. Rolling bearing on the most essential difference and that a point contact, one face Contacts, will have advantages and disadvantages in nature. Plain bearings can be used lubricating oil, grease, water, lubrication, etc..
Compared with the rolling bearings, sliding bearings advantages: 1, high carrying capacity; large contact area causes; 2, simple structure, easy manufacturing, processing, demolition; 3, good impact resistance and good vibration performance, smooth operation, high rotational accuracy. Disadvantages: 1, the maintenance complex, demanding lubrication conditions; 2 boundary lubricated bearings, friction and wear bigger. (This is also the disadvantage of a large contact area)

Compared with plain bearings, roller bearings.

Compared with plain bearings, roller bearings.What is the difference between the two? It is what strengths and weaknesses?Bearing in accordance with the different nature of friction was divided into Rolling and plain bearings, it is apparent definitely better than plain bearings Rolling friction is small, start fast, high efficiency, which is the advantage of rolling bearings. Compared with plain bearings,Rolling radial dimension is large, poor damping capacity, high speed, low life, the sound is large, which is its shortcoming. The rolling elements are not limited to the shape of the ball, as well as cylindrical roller, tapered roller, shares of the roller, and needle. According to different rolling elements, bearing into ball bearings and roller bearings. In other conditions, flexible operation roller bearings for high speed, but relatively low carrying capacity; roller bearings running better than ball bearings and flexible, but high load carrying capacity, strong impact.

Cranes bearing and marine gram make hanging bearing and other more technical features

4 m harbor cranes usually use internal or external gear teeth diameter three row roller slewing bearing to withstand high overturning moment. All kinds of cranes bearing, bucket wheel bearing, marine cranes and crane bearing usher bearing repair peak, the failure rate frequently, in order to save costs and improve the utilization of the bearing, slewing bearing repair, repair of wheel bearings business growing. About deck crane bearing appears sound, sometimes accompanied by vibrations, which may be for the following reasons:
1. Bearing heavy loss, fragmentation caused by the ball portion;
2. Ball isolation block (nylon or metal material) crushed, causing blockage;
3. bearing channel layer fatigue hardness loss, pitting, pits, pitting, bearing operation is not flexible;
4. bearing long-term stress and deformation, ovality tolerance
5. seal failure, bearing lubrication channel not long, into the channel of debris blockage.

wind power bearing technical characteristics

wind power bearing technical characteristics: a yaw bearing mounted on a tower and the cockpit of the connecting portion, the pitch bearing mounted in the hub and connected to the root portion of each blade. Each wind turbine with a yaw bearing and three pitch bearings. Yaw, pitch bearing rings of material selection 42CrMo, heat treatment with the overall quenching, raceway surface hardening. Yaw, pitch bearing force situation is complex, and to withstand shock and vibration is relatively large, and therefore, requires both bearings to withstand the impact, and can bear a greater load. Wind turbines host life requirements of 20 years, a larger bearing installation costs, thus requiring yaw, pitch bearing life expectancy should reach 20 years. Bearing rings substrate hardness 240-280HB, able to withstand impact without plastic deformation, while the raceway surface hardening hardness 55-62HRC, increase contact fatigue life, thus ensuring long life bearing requirements. Wind power bearing parts cleaning because cross, three row roller slewing bearing inner ring special technology: To prevent cross, after three-row roller slewing bearing inner heat deformation, must be working in pairs when turning, the race back to back processing, do not be cut off before the heat treatment, heat, cut molding.

Rotary classification and application of Slewing bearings

Slewing bearings are extremely important in today's heavy industry large bearing diameter ranging from 10cm to 10 meters, almost all of the large equipment reciprocating circular motion is essential, it is able to withstand a large-scale integrated load bearing, can bear large axial, radial load and overturning moment. Slewing ring bearings are generally installed with a hole, the internal gear or the external gear, lubricants holes and sealing devices, which enable the host compact design, the guide is simple, easy to maintain. Slewing bearings commonly used classification of a single row of five four-point angular contact ball slewing bearings, Single row crossed roller slewing bearing, double-row ball slewing bearing, three-row roller combination slewing bearings and slewing bearings light. Slewing ring bearings are widely used for lifting machinery, mining machinery, construction machinery, port machinery, ship equipment and high-precision radar and missile launchers and other mechanical equipment of large rotary device. But also according to the user's specific requirements and design, development and production of special structures slewing ring bearings.

Analysis of wind power bearing load zones

In roller bearings generally run only part withstand the load, and the area where this part of the roller bearing area we call the bearing. The bearing load size, running clearance will have an impact on the size of the load zone. If the bearing area is too small, the roller in the actual operation is prone to slippage. For wind power gear box, if the spindle is designed with double bearing support program, then theoretically only torque is transmitted to the gearbox. In this case, through simple mechanical analysis, we find that the planet carrier supporting the bearing load is relatively small, so the bearing area of the bearing often relatively small, roller prone to slippage. In the wind turbine gearbox design carrier support bearings generally use two single row tapered roller bearings or cylindrical bearings two full programs. We can appropriately preloaded tapered roller bearings or cylindrical roller bearings reduce clearance methods to improve the bearing area.

Wheel bearing performance

Developed on the basis of the hub bearing unit is the standard angular contact ball bearings and tapered roller bearings on, it will be two sets of bearings as a whole, with good assembly performance, you can omit clearance adjustment, light weight, compact, load capacity large, sealed bearings can be pre-loaded for the grease, hub seals and maintenance, etc. are omitted from the external wheel, have been widely used in cars, the truck also has a tendency to gradually expand the application. Car wheel bearings are used in pairs in the past most of single row tapered roller or ball bearings.

Roller wheel bearings

Single-row cross roller wheel bearings, composed by the two seat, compact, light weight, high manufacturing precision, small assembly space for the installation of high precision, the roller is 1: 1 staggered, can withstand the axial forces, tilting moment and large radial force, is widely on lifting transport, engineering machinery and military products for.Triple row roller slewing bearing has three seat, up and down and radially separated from each raceway, so that each row roller loads can be determined exactly.

Ball Wheel bearings

Single-row four point contact ball bearing turntable by the inner, outer, ball, isolated block of four major components, compact, light weight, ball and roller contact with a four-point arc path, can withstand the axial force, radial forces. Rotary conveyer, welding operation machine, small cranes and excavators and other engineering machinery can be selected. Double row ball bearing turntable with three seat, ball and isolation blocks can be directly discharged into the upper and lower raceway, according to the situation by force, arranged two rows of different diameter steel balls. This assembly is very easy to open, bearing raceways arc angle up and down are 90 °, can withstand great axial force and tilting moment. Double-row ball slewing bearing axial, radial dimension than the larger, structural tightening. Especially for applications that require above average diameter of tower cranes, truck cranes and other handling machinery.

Wheel bearing

Wheel bearings are one of the key parts of the car, its main role is to carry the weight and provide an accurate guide for the rotation of the hub, which requires that it not only can withstand axial load also bear the radial load. Conventional car wheelWith the two sets of tapered roller bearings are roller bearings or ball bearings combination, bearing installation, oiled seals and clearance adjustment is carried out in a car production line. This structure makes it difficult to assemble in the car manufacturing plant, high costs, poor reliability, and car maintenance maintenance, but also on the bearing cleaning, oiling and adjustment.

Full complement cylindrical roller bearings rust prevention in the paint

Rust paint is the feature of in a sealed motor, the start motor sounds good, but in the warehouse for a period of time, motor become very abnormal sound, remove Full complement cylindrical roller bearings serious rust. Many manufacturers will be deemed to be the front bearing, the main problem is that the insulating paint volatile acid under certain temperature and humidity of metal corrosion and protection, the formation of corrosive substances, channel sliding bearing corrosion damage.Sliding bearing life is manufacturing, assembly, closely related to the use, must make every link, in order to make the country works the best bearing, so as to prolong the service life of bearing.

1, some enterprises in the process of production coating machine Spherical roller bearings no rust cleaning procedures and oil seal antirust packing in strict accordance with the requirements of the coating machine in the process of machining bearing parts and assembly after coating machine bearing products antirust processing. Such as ring in the process of turnover turnover time is too long, outer cylindrical contact corrosive liquids or gases, etc.

2, some enterprises in the production of antirust oil, cleaning products such as kerosene used quality can not reach the requirements of the technology.

3, due to a coating machine bearing steel price drop down again, resulting in coating machine bearing steel quality decline gradually. Such as non-metallic impurities content in steel on the high side, the increase of sulfur content in steel making material itself corrosion resistance drops), metallurgical structure deviation, etc. Is now used in the coating machine production enterprise source of bearing steel is miscellaneous, steel quality ichthyosaurs fraud.

4, part of the enterprise's poor environmental conditions, harmful content is high in the air, flow field is too small, it is difficult to effectively antirust processing. Coupled with the hot weather, the production workers in violation of the phenomenon such as antirust procedures were there.

5, some enterprises anti-rust paper, nylon paper (bag) and plastic tube coating machine, such as sliding bearing packing material is not accord with the requirement of roll coater bearing oil seal rustproof packaging is one of corrosion factors.

6, some enterprises coating machine sliding bearing ring turning small allowance and allowance of grinding, the oxide coating on the outer circle, failed to completely remove decarburization layer is also one of the reasons.

The choice of Deep groove ball bearing in the bearing shell

Deep groove ball bearing on the job as a result of the journal and bearing contact will produce friction, surface cause fever, even "killed", so in the design of the bearing, should choose Excavator Slewing Bearing materials with good sex of anti-friction bearings, suitable lubricant and appropriate supply method is adopted to improve the bearing structure for thick film lubrication, etc.

1, tile surface corrosion: spectrum analysis found that non-ferrous metal element concentration anomaly; Spectrum appeared a lot of non-ferrous metal components of sub-micron wear particles; Lubricating oil excess moisture, acid value exceeds bid.

2, shaft neck surface corrosion: spectrum analysis found that iron concentration is unusual, there are a lot of iron in iron spectrum of submicron particles, water or high acid value oil paint.

3, a shaft neck surface strain: iron spectrum have iron series cutting grinding grain or black oxide particles, metal surface heat tint.

4, tile back micro wear: spectrum analysis found that iron concentration is unusual, there are a lot of iron in iron spectrum wear submicron particles, lubricating oil moisture and acid value anomalies.

5, a bearing surface strain: iron spectrum found cutting abrasive, abrasive ingredients for non-ferrous metal.

double direction thrust ball bearing manufacturing materials

1) metal materials, such as bearing alloy, bronze, aluminum alloy, zinc base alloy, etc

double direction thrust ball bearing, bearing alloy is also called the white metal, tin, lead, antimony and other metal alloy, because of its good wear resistant, high plasticity, running-in performance is good, good thermal conductivity and resistance to adhesive and good and good and oil adsorption, therefore applicable to the overloading, high-speed cases, the strength of the bearing alloy is small, the price is more expensive, must be cast in bronze, steel or cast iron shell, form a thin coating.

2) the porous metal material (powder metallurgy materials)

Porous metal materials, metallurgical bearing is a kind of powder material, it has porous organization, if the immersion in the lubricating oil, full of lubricating oil in the pores, into the oil bearing, has self lubricating performance. The toughness of the porous metal material is small, only suitable for smooth without impact load and medium and small speed.

3) non-metallic materials

Commonly used bearing bearing plastic: plastic with phenolic plastics, nylon, ptfe and so on, plastic bearings have larger compressive strength and abrasion resistance, oil and water lubrication, also has the self-lubricating properties, but poor thermal conductivity.

Plastic bearings and metal sliding bearing the following differences:

1, the single direction thrust ball bearing are lubricating material, long service life. The metal sliding bearing lubrication layer is only 0.003 mm of PTFE surface, thin layer when the friction after it proclaims the end of the service life; 2, plastic bearings use will not happen in phenomenon of rust and corrosion resistance, and metal type of bearing is easy to rust cannot be applied to chemical liquid; 3, plastic lighter than metal bearing quality, it is more suitable for modern lightweight design trend; 4, rolling mill bearing manufacturing cost is relatively lower metals; Plastic bearings is the injection molding processing and become more suitable for mass production; 5, plastic bearings in operation without any noise, has a certain vibration absorption function; Due to plastic bearing is metal sliding bearing has many advantages, the production of plastic bearing is expanding increasingly, the use of plastic bearing situation is outspread, from fitness equipment to the office equipment and automobile industry, and so on all use plastic bearings, run on the roads of the car was not to use plastic bearings. Plastic bearing the market foreground is wide!

The composition of four point contact ball slewing bearing structure

The work of four point contact ball slewing bearing is sliding friction; The rolling friction is mainly depends on the size of the manufacturing accuracy; And the size of the sliding bearing friction is mainly depends on the slip plane of the bearing material. Sliding bearing generally face all have self-lubricating function; Sliding bearing according to the material divided into sliding bearing and sliding bearing metal, not of metal.

Non-metallic offshore crane bearing mainly plastic bearings, plastic bearings are generally USES the engineering plastic with good performance comparison; More professional manufacturers generally have self-lubricating engineering plastics modification technology, through the fibers, special lubricants, glass beads and so on to self-lubrication engineering plastics modification to enhance performance, and then use modified plastics by injection molding processing into self-lubricating plastic bearings.

Metal sliding bearing is currently the most used three layer composite bearings, the bearings are generally based on carbon steel substrate, through sintering technology in steel plate on a layer of spherical copper powder sintered first, and then sintering layer on copper powder layer is about 0.03 mm PTFE lubricant; One intermediate layer spherical copper powder main effect is to enhance the bonding strength between the steel plate with PTFE, at work, of course, also have certain bearing and lubrication effect.

The main characteristics of thin wall bearings folding edit this paragraph

Commonly used material of thin wall bearings is bearing alloy (also called babbit or white metal), miniature linear bearings wear resistant cast iron, copper and aluminum alloy, powder metallurgy materials, plastics, rubber, hardwood and carbon - graphite, PTFE (teflon, PTFE), modified polyformaldehyde (POM), etc.

linear plain bearings

linear plain bearings work under sliding friction bearings. Sliding bearing work steady, reliable, no noise. Under the condition of fluid lubrication, sliding surface is lubricating oil without direct contact, also can greatly reduce the friction loss and wear of surface oil film also has a certain vibration absorbing ability. But starting frictional resistance is bigger. The mobile crane bearing parts of the shaft are called journal, and shaft neck matching parts called bush. In order to improve the bearing surface of the friction properties and in them on the surface of cast anti-friction material layer is called the bearing bush. Bearing and bearing liner material collectively known as the sliding bearing material. Sliding bearing applications generally under the condition of low speed and heavy loading conditions, or maintenance and charging of lubricating oil is difficult work.

Triple row roller slewing bearing

Flange bearings from printers, fax machines to monitor, using household items in their daily lives, there my company's products bearing the bearing show technology space.ABEC-1 in standard dimensions and accuracy requirements, produce bearings, which can meet the general use of the product.
Outer flange on the series, is the axial position is simple: no longer need housing, Taper roller bearings more cost effective.To get bearings low-friction torsional Rotary precision, high rigidity and good the Cabinet, using small-diameter steel balls.The use of hollow shaft, to ensure that the light-weight and wiring space.Main use: Robotics, medical devices.Office equipment.Medical instruments.Slow speed device.Motor.Optical imaging devices. taper roller bearing The card reader.

Thin section bearings

High speed bearing installation and adjustment:
1. high speed bearing fit and clearance due to the high speed bearings according to requirements of high precision bearings, and required by the high temperature bearings, so when considering the fit and clearance, to take into consideration the following two points:
(1) rose from room temperature to high temperature dimensional change and hardness changes;
(2) high-speed centrifugal force caused by the force of change and shape change.
In short, in conditions of Slewing drives, high temperature, from coordination and clearance on the choice to try to keep the accuracy and performance of the bearing, which is difficult.
In order to ensure that after installation of bearing Raceway deformation is small, KOYO 7319AC angular contact ball bearings fit interference cannot be made too large, of centrifugal force and high speed and high temperature thermal expansion, or offset the mating surfaces of the normal pressure.Or Flange Slewing Bearing relaxing the mating surfaces, interference must therefore consider the premise of these two factors carefully calculated effective interference at room temperature under normal speed for high precision bearings may be invalid.

Exponentially growing of wind power installed capacity

From the current wind power bearing development situation, the wind power installed capacity will grow exponentially, the planning objectives will be greatly exceeded. 2007 is estimated to reach 5 million kilowatts, eleven five to three years ahead of the target planning.

  Experts predict that by 2020 will reach 120,000,000 kilowatts,crane bearing ， an average annual increase of 10 million kW .

Development strategy according to the China energy today, the state will greatly improve the wind energy（ wind power bearing ）, solar energy, biomass and other renewable energy in the whole energy consumption.

  The proportion of. In this strategy under the guidance of this year, to Chinese wind power industry development quickly.

  According to the Chinese renewable energy and long-term development plan put forward the development of wind power target,metallurgical bearing

• In 2010 the national wind power installed capacity has reached 5 kilowatts million
• In 2015 the national wind power installed capacity has reached 15 kilowatts million
• In 2020 the national wind power installed capacity reached 30 kilowatts million

Chinese wind power industry and wind power bearing market potential

Chinese exploitable wind energy to total about 1 billion kW (of which the land wind energy reserves of about 297,000,000 kilowatts, offshore crane bearing wind energy reserves of about 750,000,000 kilowatts),

agricultural bearings，by the end of 2006, China's wind turbine installed capacity of 2.6 million kilowatts, can be developed wind power accounted for only less than 3 of the total%, the wind power bearing industry development with big potential.

Wind power bearing driven by the wind power industry

The rapid growth of the wind power bearing industry, must be based on the rapid growth of wind power equipment as the support,which will inevitably lead to strong demand for bearings in wind turbine.

  In recent years, the world's two wind power bearing and deck crane bearing suppliers although full load production, also in short supply, or loving some wind power equipment  bearing manufacturer has to China buy bearings.

Wind power bearing and the future wind power development

The future of wind power has the very big development space. European plan to achieve by 2020 renewable energy accounted for 20% of the total generating capacity,wind power bearing accounted for 12%.

  It is understood, now the global wind power accounted for the proportion of total generating capacity is only 1.10%. To achieve the 12% target,agricultural bearings also need to grow nearly 10 times.

  European wind energy Association predicted that, prior to 2020, the annual increase of wind power installed capacity will be maintained at more than 15 million kilowatts.

Wind power bearing and global wind power development

The relative scarcity of traditional energy, environmental pressure and geopolitical strong sense of insecurity,deck crane bearing so countries spare no effort in the development of renewable energy including wind power. The wind power industry has been covering the continents of the world, and the trend of rapid growth.

  By the end of 2006, global wind power installed capacity has reached 74,223,000 kilowatts, by the end of 2006, wind power bearing installed capacity of more than 1000,000 kilowatts countries Germany, Spain, India, Denmark, USA, China ranked 6.

Wind turbine generator shaft conclusion and wind power bearing

Japan and Europe and the United States compared to wind power generation popularity of atmospheric conditions, Japan is seeking to adapt to the typhoon, lightning and other weather conditions in winter in Japan high reliability of wind power bearing generator.

NTN is committed to improving the reliability of the fan bearings,agricultural bearings let the wind machine manufacturers and users to rest assured that the use of bearings, provide very good the most suitable bearing specification selection and high quality products for wind turbine manufacturer and user thereby,deck crane bearing make greater contributions to the development of global wind power generation.

Taper roller bearing longevity

In order to achieve taper roller bearing longevity,we can use carbonitriding of ETA bearing processing.

  ETA bearings, as a special heat treatment, residual austenite and carbide surface part of the dispersed properly, good thermal stability, high tolerance to peeling strength of foreign body in lubricating oil, is a kind of long life wind power bearing .

  Through the correlation method, we have reached the requirement of bearing technology of small, high reliability.

wind power bearing and bearing for yaw gear box

Due to yaw gear box requirements for small and large torque transmission, so the deck crane bearing is also pursuing a small design and high load capacity. Therefore, the raceway ring use thin-wall angular contact ball bearings and taper roller bearing .

If the angular contact ball bearing load large axial load, it is necessary to improve the inner ring andouter ring raceway groove rib height, as a special design to increase the allowable axial load.Compared with the yaw gear box for special products and standard products, ensure Gao Rongxuaxial load of about 9 times（wind power bearing）.

The car wheel bearing of the past

The car wheel bearing of the past is the most used in pairs of single row tapered roller or ball bearing.

   With the development of technology, the use of car wheel hub unit cars have been widely. The scope of use of hub bearing unit and use the growing, has now developed to the third generation.

   The first generation is composed of double row angular contact bearing components. The second generation in the outer raceway has a flange bearing for fixed, will be simple bearing sleeve to the shaft is fixed by the nut, making the car repair easier.

Insulation bearing for generator

Bearing  used for generator,to prevent the phenomenon of electric spark for bearing internal conductive induced (electrical erosion), and improve its reliability is essential.

  We have developed through the use of special ceramics and improvement of metal spraying method, ensure that the monolayer type insulating ability and reliability of the new deck crane bearing product.

  Insulation resistance value more than 100M Omega, dielectric breakdown voltage of insulating performance is more than 2KV, the insulation performance to meet the requirements of wind power bearing generator.

Use conditions of planetary gear

A comprehensive experimental study, planetary gear subject can be summarized as the following 3 points.

• Effect of gear and deck crane bearing outer ring of elastic deformation.
• Effect of non linear planetary bearings caused by the bracket distortion
• Effect of lubricating oil deficiency 

  The selected optimal bearing take full account of these characteristics. As the planet gear, in these conditions of use,high speed bearing load capacity and light load conditions, we try to reach the optimum rib design and the axial clearance of sliding friction and adhesion is very strong.

   In addition, to achieve long life through a special heat treatment.

Maximum contact surface pressure

Maximum contact surface pressure of self aligning roller bearing exceeds the set value,  need to increase the size of bearing. Then prolong the life calculation and reduce the maximum contact surface pressure.

  On the contrary, the body is very difficult to roll in the raceway surface rolling at light load, sliding increasing with danger raceway surface damage.

  Therefore, we recommend the above minimum load in the basic load rating of 4%. In the surface of lubricating , need method of wind power bearing starting without making planetary bearing lack lubricating  on the surface of the part of oil.

Planetary bearing and gear box

Gear box is composed of an input shaft, planetary, low-speed shaft, intermediate shaft, high speed shaft.

  Planetary bearing use self aligning roller bearings and Full complement cylindrical roller bearing. In the analysis model of planetary bearings, the bearing load as  load of rolling body, fixed each gear occlusal point of internal gear end and the sun gear end , considering the outer ring deformation,to calculate bearing life.

  According to the analysis results, consider the life calculation of elastic deformation of the ring, in each column between the maximum difference of 58% generation,  we believe that the bracket end column compared with the other column end load load calculation of high proportion, short service life.

  Maximum contact surface pressure bearing gear box for the self-aligning roller bearing are calculated in the case of cylindrical roller bearing with point contact, line contact is used to obtain the. And the application considered in the calculation of non linear specification tendency.

The stress analysis of crankcase

According to the stress analysis of the crankcase, consider the strength, confirm the deformation amount and bearing clearance of crankcase and bearing, calculating deck crane bearing life, and try to optimize the bearing and axle box.

  The maximum deformation of 1.5MW shaft bearings and axle radial fan for 0.07mm. Considering the calculation results of deformation and bearing clearance  and the crankcase as steel body life difference within 5%, this value in practice is not a problem. The life of difference, life is shortened, then, must change the axle box design, improve the rigidity.

Mainstream of bearing types

For bearing types,self-aligning roller bearing and tapered roller bearing is the mainstream, but most of the use of self-aligning roller bearings in the non linear favorable. Non linear spindle generally need to consider the plus or minus 0.5 degrees.
As B type automatic self-aligning roller bearing  is designed by the use of the middle block side guide roller , it is no skew of the maximum load wide in the minimum load to load region , which can run in a stable torque and low fever cases.
In addition,vibration of blade and gear box vibration increasing of the rotor shaft bearing, there is danger of corrosion and friction .Therefore, optimal bearing selection and clearance and mating and selection of suitable oil is very important.

Bearing life

Accelerate blade rotation in order to achieve the rated revolution of induction generator by a speed increaser, design to take necessary strong of crankcase into account when wheel bearing at maximum loads .

  So is study on  bearing life when the displacement of axle box  at average loads. Choose to meet practical axle box design and the  fully simplified calculation of spindle bearing life.

  In addition, consider the box and the outer ring raceway surface deformation, the calculation of every needle roller bearings load and calculate the rotation ring and fixed ring their life.