Deep Groove Ball Bearings reduce noise in electric motors.

By optimising the contact geometry between the rolling elements and the ring raceways, Schaeffler's new 'Generation C' deep groove ball bearings are ideal for electric motors, providing 35% less friction and 50% less noise.

For designers of electric motors and for plant operators who use these motors, efficiency, noise and vibration levels of the motor are key design and quality criteria. The efficiency of small electric motors with low capacity - the type often found in electrical consumer goods such as washing machines, power tools and ventilators - is mostly determined by the power loss of the internal bearings.

The Schaeffler Group has therefore developed the 'Generation C' range of deep groove ball bearings, which not only offer 35 per cent less friction than its predecessor, but also cut noise levels by 50 per cent. This means a more efficient motor, resulting in reduced energy consumption. The new design improvements mean that the bearings can achieve higher running speeds (rpm), whilst simultaneously increasing the life of the bearing.

The bearings are therefore ideal for applications in which low noise and smooth running are critical. Reduced friction levels and improved energy efficiency from the bearings means a reduction in running costs for plant operators and a more efficient machine with extended maintenance intervals.

In order to reduce friction by 35 per cent, Schaeffler optimised the osculation (raceway curvature) between the balls and rings on the new bearings. This means there is less chance of misalignment between the inner and outer ring. As well as offering less friction, the bearings also generate less heat, making them suitable for higher running speeds.

Schaeffler also modified the seal on the bearings. The new novel HRS seal has modified double lip geometry and is made from nitrile butadiene rubber. These have been adjusted to match the recess on the bearing inner ring. Axial contact between the inner ring and the seal means more effective protection against contamination or loss of grease and less frictional torque. This results in longer grease life, increasing the life and reliability of the bearing and provides improved bearing performance at higher speeds (rpm).

Venting grooves have also been added in order to improve the run-in behaviour of the bearings. In addition to the HRS seal, the bearing shield has been modified. The recesses on the bearing rings and the shield geometry are functionally adjusted to each other in such a way that the sealing efficiency is improved and grease life increased. The new design creates an axial and radial labyrinth with the shield.

The improved guidance of the rolling elements also contributes to higher performance of the bearing. The new riveted steel cage, which replaces the previous steel 'ribbon' cage, offers higher rigidity and so is suitable for higher running speeds. The riveted steel cage also reduces noise levels and means the bearing is less sensitive to shock loads. The manufacturing tolerance of the bearings has also been increased (to P5 Abec 5 standards), ball roundness to G5 tolerances and improved surface finish.

The dimensions of the new bearings correspond to the previous bearing types, enabling easy replacement. Generation C bearings can operate in temperatures from -30°C up to +120°C.

The bearings are available with outside diameters from 26mm up to 90mm. Riveted steel cages are standard, although polyamide cages are optional. P6 or P5 tolerances can be specified on ordering. Sealing options include one or two gap seals; one or two lip seals; or low friction, non-contact labyrinth seals.

From: http://news.thomasnet.com/fullstory/Deep-Groove-Ball-Bearings-reduce-noise-in-electric-motors-561078

Stainless steel deep groove ball bearings and its tolerances

There are several common designs of ball bearing, each offering various trade-offs. They can be made from many different materials, including: stainless steel, chrome steel, and ceramic (silicon nitride (Si₃N₄)). A hybrid ball bearing is a bearing with ceramic balls and races of metal.

SKF stainless steel deep groove ball bearings are resistant to corrosion from moisture and several other media. These single row deep groove ball bearings have the same deep raceway grooves and close conformity between raceways and balls as standard deep groove ball bearings made of carbon chromium (rolling bearing) steel. They are without filling slots and can carry axial loads acting in both directions in addition to radial loads, even at high speeds. SKF stainless steel deep groove ball bearings have the same running properties as conventional steel deep groove ball bearings, but have a lower load carrying capacity. The bearings are available in open and sealed designs for shaft diameters from 1 to 50 mm. SKF stainless steel bearings are identified by the designation prefix W, e.g. W 626-2Z.

SKF stainless steel bearings in metric sizes are produced to Normal tolerances as standard. Some sizes are also available to tolerance class P6 or P5 specifications. The tolerances conform to ISO 492:2002, classes Normal, 6 and 5. The inch-size bearings are produced with Normal tolerances for inch-size bearings as specified in BS 292:Part 2-1982 (now withdrawn).

Deep groove ball bearings

Deep groove ball bearings
Deep groove ball bearings are used in a particularly wide variety of applications. Consequently, they are available in many executions and sizes. The standard SKF range comprises the following types: – single row deep groove ball bearings – SKF Energy Efficient deep groove ball bearings – single row deep groove ball bearings with filling slots – stainless steel single row deep groove ball bearings – double row deep groove ball bearings – single row hybrid deep groove ball bearings, see section "Engineering products - Hybrid bearings" – single row deep groove ball bearings for high temperatures, see section "Engineering products -Bearings and bearing units for high temperatures" – cam rollers, see section "Track runner bearings - Cam rollers" – polymer ball bearings, see section "Engineering products - Polymer ball bearings" Single row deep groove ball bearings Single row deep groove ball bearings are particularly versatile. They are simple in design, non-separable, suitable for high and even very high speeds and are robust in operation, requiring little maintenance. Deep raceway grooves and the close conformity between the raceway grooves and the balls enable deep groove ball bearings to accommodate axial loads in both directions, in addition to radial loads, even at high speeds. Single row deep groove ball bearings are the most widely used bearing type. Consequently, they are available from SKF in many executions and sizes: – open basic design bearings  – sealed bearings  – ICOS® oil sealed bearing units  – bearings with snap ring groove, with or without snap ring  Other deep groove ball bearings for special applications, shown in the "Engineering products" and "Mechatronics" sections, include: – hybrid bearings  – insulated bearings  – high temperature bearings  – bearings with Solid Oil – sensorized bearings – polymer ball bearings  The SKF product range also includes bearings with a tapered bore. This variant is not included in this catalogue. Information will be provided on request. Deep groove ball bearings with filling slots Single row deep groove ball bearings with filling slots have a filling slot in both the inner and outer ring  enabling more and larger balls to be incorporated than in standard deep groove ball bearings. Filling slot bearings have a higher radial load carrying capacity than bearings without filling slots, but their axial load carrying capacity is small. They are also unable to operate at such high speeds as bearings without filling slots. Depending on the main application for which they are used, deep groove ball bearings with filling slots have a cage  or no cage. The smaller sizes, which are mainly used for automotive gearboxes and are identified by a standard designation, incorporate a cage. The standard assortment of these bearings comprises – basic design open bearings – shielded bearings – bearings with a snap ring groove. The large-size bearings which are designed for heavily loaded, slowly rotating applications are without cage. Stainless steel deep groove ball bearings SKF stainless steel deep groove ball bearings are resistant to corrosion from moisture and several other media. These single row deep groove ball bearings have the same deep raceway grooves and close conformity between raceways and balls as standard deep groove ball bearings made of carbon chromium (rolling bearing) steel. They are without filling slots and can carry axial loads acting in both directions in addition to radial loads, even at high speeds. SKF stainless steel deep groove ball bearings have the same running properties as conventional steel deep groove ball bearings, but have a lower load carrying capacity. The bearings are available in open and sealed designs for shaft diameters from 1 to 50 mm. SKF stainless steel bearings are identified by the designation prefix W, e.g. W 626-2Z. Double row deep groove ball bearings SKF double row deep groove ball bearings correspond in design to single row deep groove ball bearings. They have deep uninterrupted raceways and high conformity between the balls and raceways. They are able to carry axial loads acting in both directions in addition to radial loads. Double row deep groove ball bearings are very suitable for bearing arrangements where the load carrying capacity of a single row bearing is inadequate. For the same outside and bore diameters, double row bearings are slightly wider than single row bearings but have considerably higher load carrying capacity than single row bearings in the 62 and 63 series. From http://www.skf.com/portal/skf/home/products?newlink=1_1_0

Guaranteed methods of quenching technology of deep groove ball bearings

Selecting an appropriate quenching medium is particularly important. It determines the bearing microstructure and properties after quenching. Quenching medium usually has solid, liquid and gas three forms.

Deep groove ball bearings in heat treatment furnace heated to fully austenitic, for obtaining the required organization and performance, it need for a quenching treatment. Workpiece after cooling to obtain martensite organizations, its cooling rate must be greater than the critical cooling rate, but too cool and too fast will make volume shrinkage and microstructure transformation violent, caused a great deal of stress. Thus conditions for martensitic "f" should enable the cooling rate as low as possible.

NTN bearings after correct repairing are the same performance with new bearings. The precision parameter such as its clearance can meet the requirements of new bearings. It is important to understand and identify damage degree to choose the correct rehabilitation program. For example, surface finishing treatment can clear some minor damage, but could not clear the real fatigue and the debris or wear caused by depression. Therefore, if only for the NTN bearing surface finishing treatment, generally it is not suitable for serious injury deep groove ball bearings. And if fully repair remanufacturing technology, the fatigue of bearing layer is completely clear, replace the rolling elements, also cage being undertaken a comprehensive consolidation so that bearings can meet the performance requirements of a new bearing.

Once the deep groove ball bearings injure, they must go through a very rigorous testing procedures to determine whether the injury NTN bearings can be repaired. Bearings must be fully cleaned, and then a very rigorous and comprehensive testing. The first is to detect whether the bearing damage, such as cracks, spalling and thermal discoloration, bearing with these injuries are likely beyond repair and must be scrapped.

Raceway surface of deep groove ball bearings, due to contacting with the roller elements, its running track is the dark side, track attached to the roller surface is within the exception, which may be able to tell the load conditions, so in removing the NTN bearing cases, pay strict attention and observe of raceway surface running track, you will learn the it bears only radial load, subjected to an axial load, tolerance for moment loads, or extreme inequality of rigid on the bearing box.

1, appropriate clearance of NTN bearing, too large will impact, too small will be poor lubrication, may be burnt.

2, improve lubrication quality and control oil pressure, temperature and flow, strengthening the oil filter.

3, geometry and surface quality of NTN bearings and axle should be strictly guaranteed.

4, adopted the fuel and lubricating oil in accordance with the demarcation.

5, take control of engine temperature, overheating or in cold case work is negative. In cold weather, diesel engine should warm up before starting, scroll with the hand crankshaft oil into the friction surface.

Four specific ways to handle high temperature of deep groove ball bearings

When deep groove ball bearing' temperature rise, first determine whether the malfunction is wrong, if it rises indeed, it should be dealt with as follows:

(1). check cooling water pressure, flow and whether pipe systems are functioning correctly. If the water pressure low, may be filter clogged, you can shut down if cannot be processed in a timely manner, when it works, put into use again.

(2). check the speed governor oil pressure, low oil pressure may cause the cooling water of hydraulic valve close.

(3). check bearing abnormal noise, and inspect the swing of deep groove ball bearings for exceptions.

(4). take sample to observe whether oil color is changing, and test to see if bad. If confirmed, shut down replace new oil.

(5). check whether oil level is normal, if irregular, check that the oil drain valve is closed. If it is closed tightly, please supplement oil, if sealing pad is oil leakage, stop the machine and handle it.

When we use bearing, if its in very hot situation, then quickly stopped operating, and then find out its causes, and provide solution for processing in accordance with the above. But, due to different reasons for heat of deep groove ball bearings, there are  different ways to resolve, so it should be treated and completed with the assistance of technical staff.

(A) filling grease method

So-called filling grease method is to fill in the right amount of grease to the bearing working surface regularly, which is one of the most commonly used way of lubricating grease.

(B) oil Cup method

Oil Cup method is to set the capping oil cup or pressure oily cup on bearing housings, rotating the capping and injecting the grease on with grease guns to apply grease injection. This is a commonly used way of lubricating grease.

(C) pressure for grease method

Pressure for grease method is to rely on the grease pump for grease. You should use good fluidity of lubricating grease.

(D) Centralized greasing method

Centralized greasing method is to supply grease for the deep groove ball bearings and other parts through the grease pump. Similarly, the grease used should be sacrifice good liquidity and excellent oxidation resistance and corrosion resistance.

Deep groove ball bearings

Application of deep groove ball bearings are particularly broad scope. Therefore, there are many varieties and sizes of them. SKF standard series is composed of the following types:
Single row deep groove ball bearings
Single row deep groove ball bearings with filling slots
Stainless steel deep groove ball bearings
Double row deep groove ball bearings
Hybrid deep groove ball bearings
Deep groove ball bearings for high temperature applications
Cam rollers

1, single row deep groove ball bearings

Single row deep groove ball bearings are with particularly wide application. This type of bearing is designed to be simple for non-separable, suitable for high speed, even for very high speed and very durable in operation, almost no maintenance. Bearing Raceway of deep groove and the high tie between raceways and balls, deep groove ball bearings in addition to radial loads, can accommodate axial loads in both directions, even at high speeds as well.

Single row deep groove ball bearings are one of the most widely used bearings. Therefore, SKF has many varieties and sizes:
Open basic design bearings
Sealed bearings
ICOS oil sealed bearing units
With open ring groove of bearings, bearings with snap rings rings with or without opening.
Product family also includes bearings with a tapered bore.

2, deep groove ball bearings with filling slots

There is one filling slots on the ring and the outer ring of single row deep groove ball bearings with filling slots. Bearings with filling slots have a higher radial load capacity than bearings without filling slots, but their axial load carrying capacity is small. Moreover, this bearing should not be at the same standard bearings under the same high speed running. Depending on different applications, deep groove ball bearings with filling slots can be caged or without cage.

Small dimensions of these bearings are mainly used in automobile gear box, standard model identification, with cage.

Applications designed for heavy loads and low speed rotation of large bearings without cage.

3, stainless steel deep groove ball bearings

Stainless steel deep groove ball bearings can withstand moisture and corrosion caused by a number of other medias. This type of single row deep groove ball bearings the same as standard deep groove ball bearings, bearing raceway with a deep ditch, Compatibility between raceways and balls is extremely high. The bearings is without filling slots, in addition to radial loads, also subjected to bi-directional effects of axial loads, even at high speeds as well.

Operating characteristics of stainless steel deep groove ball bearings are the same as conventional steel deep groove ball bearings, but the load carrying capacity is low.

The bearings are provided with an open and sealed design, shaft sizes from 1 to 50 mm.

Model prefix w stainless steel bearings, for example, W626-2Z.

4, double row deep groove ball bearings

Double row deep groove ball bearings echoed with single row deep groove ball bearings in the design. These bearings have deep uninterrupted raceways and high tie between the balls and raceways. In addition to radial loads, they are also subjected to bi-directional effects of axial load.

Double row deep groove ball bearings are ideal for single bearings low bearing load of the bearing arrangement. Outer diameter and inner diameter of the same case, the double row bearings are slightly wider than single row bearings, but substantially higher than the load capacity of the 62 and 63 series single row bearings.

5, hybrid deep groove ball bearings

Standard ceramic hybrid bearings are mainly single row hybrid deep groove ball bearings. The reason is clear: deep groove ball bearings are the most widely used bearing type, particularly in the motor. Close fit between deep raceway grooves and roller, makes it able to withstand radial loads and axial loads in both directions.

inner ring diameter of Hybrid deep groove ball bearings varies from 5 to 110mm, and can meet the needs of most applications. Larger bearings can be customized.

6, deep groove ball bearings for high temperature applications

The bearings are without filling slots, in addition to radial loads, can accommodate moderate axial loads. This is characterized by radial internal clearance of the bearing and is equipped with a special cage. Large clearance is four times the C5 clearance, even in rapid cooling can prevent bites in the bearing. All surfaces of the bearing and the housing are manganese phosphate. It has antiseptic effect, and improve operational performance.

High temperature deep groove ball bearings are with a cylindrical bore, there are five different forms, as described follows.

VA201, for the most common applications
VA201 bearings without seal, with pressed steel cage. Using poly (alkyl-Asian) glycol/graphite mixture lubrication and can be used from-40 to + 250 ° c temperature range. At the time of high temperatures above + 200 ° c, suitable for dry lubrication.

2Z/VA201 with shield
2Z/VA201 has the same design as the VA201 bearings. There areshield on both sides to prevent solids from entering. In addition, the bearing load of poly (alkyl-Asian) glycol/graphite mixture amount is twice times the open VA201 bearings.

2Z/VA208-used in high temperature
Bearing 2Z/VA208-equipped with a segmented cage of graphite,-150 to + 350 ° c temperature of the environment. Graphite in the paragraphs to separate the bowls, at the same time provide the necessary lubrication. Bearings are equipped with two shield, axial guide cages and prevent solids from entering. When cage is rotated graphite powder released particles provide adequate lubrication for the bearing.

Another advantage of these bearings are good environmental performance. Even at the highest temperatures, and no dangerous gases or steam comes out.

-2Z/VA228, can be used for the highest requirements
2Z/VA228-bearing is SKF high-temperature applications in the "best". Pure graphite with "ball" cage, the cage has opened up more areas of application for this high temperature bearings. Spherical cage is a unique invention of SKF, allows running at speed of up to 100r/min.

2Z/-VA216 for corrosive environments
When corrosive in application environments are especially strong, 2Z/VA216 design bearings are recommended. The bearings are filled with milky white all purpose grease this grease with a mixture of PTFE based fluorinated polyether oil that can be used from-40 to + 230 ° c temperatures. Bearing design and 2Z/VA201 are the same in other areas.

Under normal circumstances, the lubricant in the bearing filled free space and 25. On request, you can provide other fill level.
Deep groove ball bearing General by pair rings a group keep frame, a group just ball composed and a group keep frame constitute, deep groove ball bearing type code for 6. is production most general, application most broad of category bearing. deep groove ball bearing structure simple, using convenient, is production bulk maximum, and bear must of axis to load. Dang bearing of radial tour gap increased Shi, has corner contact ball bearing of features, can bear larger of axis to load.

Deep groove ball bearings are mainly used under purely radial load, can bear both radial and axial loads, when it is only when you take pure radial loads, contact angle is zero. When a deep groove ball bearing with larger radial internal clearance are, with angular contact bearings, can withstand greater axial loads. small coefficient of friction of deep groove ball bearings, speed limit is also very high, especially in axial load is a lot of fast-moving conditions, Deep groove ball bearing than thrust ball bearing more has superiority. and size same of other class bearing comparison, this class bearing friction factor small, limit speed high. in speed higher not used thrust ball bearing of situation Xia available the class bearing bear axis to load. deep groove ball bearing mounted in axis Shang yihou, can makes axis or shell of axis to displacement limit in bearing of axis to tour gap range within. While, dang shell hole and axis (or outer ring internal ring) relative has tilt Shi, (not over 8-16 according to tour gap determines) You can still work properly. However, that tilt, is bound to reduce the service life of the bearing.

Deep groove ball bearings compared with other types of bearings of the same size, minimal friction loss, higher speed limit, in the case of thrust ball bearing in high speed should not be used, such bearings are subjected to purely axial load. If improving the precision of their manufacturing, and bakelite, bronze, solid cage for hard materials such as aluminum, its speed increases.

Check more details at http://www.ziso.cn/ or more products at http://www.hisupplier.com/a-single-row-ball-bearing/.

Compressive strength influences on the performance of IKO deep groove ball bearings

Compressive strength refers to the ability that do not crush or size does not change when bearing accomodate load.

How to ensure deep groove ball bearings used normal in the course, how to make IKO bearings be without injury and with longer life.Let me introduce some notes making bearing work well, which I wish to help you. Under normal circumstances, there are points as follows:

1, appropriate clearance of deep groove ball bearing, too large will impact, too small is poor lubrication that may be burnt.
2, improve quality of lubrication and control oil pressure, temperature and flow, strengthen the oil filter.
3, deep groove ball bearings and axle geometry and surface quality should be strictly guaranteed.
4, adopted in accordance with the demarcation of the fuel and lubricating oil.
5, control of engine temperature, in the under cooling or overheating cases is negative. In cold weather, preheating before starting of diesel engines and scroll hand crank that oil into the friction surface.

Cleanliness of bearing considerable influence on bearing life considerably. IKO bearings have special tests, with the result that their differences for a few times and even dozens of times to more than double. Higher cleanliness of bearing,the longer life.Therefore, improving the cleanliness of the lubricant can extend bearing life, also, with dirt particles of lubricating oil control under below 10 um, IKO bearings life can increase.

Influences on the lubrication properties

 IKO bearings drop in cleanliness, not only affect the lubricant film formation, but also cause deterioration and aging of grease, thus affecting the grease lubrication performance.