Installation method and use of single row deep groove ball bearings

Bearings are precision components, and thus require considerable caution when used, even using the high performance of single row deep groove ball bearings, if used incorrectly, could not achieve the desired performance, and easy to make bearing damage. Therefore, you should be aware of the following considerations:

First, keep the bearings and the surrounding environment clean

Even if invisible dust into the bearing, bearing wear, vibration and noise will increase.

Second, be careful when you install

Do not punch powerfully, does not tap the bearings directly with a hammer and transmitting pressure on bearing through the rolling elements pressure is not allowed. Don’t open the single row deep groove ball bearings package until installing. General grease lubrication, do not clean bearings and fill the grease directly. Oil lubrication, generally do not have to clean, however, instruments or high speed bearings,clean bearing with clean oil, removing rust inhibitor coating on the bearing. Bearings after removing rust, are easy to rust, so they cannot be placed at random.

Third, use appropriate and accurate installation tools

Installing approach of single row deep groove ball bearings varies due to the bearing structure, conditions and fit. As generally are axis rotation, take the inner ring interference fit. Bearings with a cylindrical bore installation, press into with the press, or hot charging method. Bearing with tapered bore installation, directly fix on the tapered shaft or using an adapter sleeve. Using special tools as much as possible, avoiding using fabric and staple fiber or something.

Four, prevent corrosion of the bearings

Fully wash away the sweat on his hand when taking bearings directly by hand, and coated with high quality mineral oil before operation, paying particular attention to rust during the rainy season and summer.

However, in some special operating conditions, single row deep groove ball bearings get more longer life than the traditional calculation, especially under light load conditions. These special conditions are, when scrolling surface (track and rolling elements) is effectively separated by lubricant film and limiting surface damage caused by pollutants. In fact, in ideal conditions, the so-called permanent bearing life is possible.

Bearing life

Single row deep groove ball bearing life is detemined revolutions (or number of working hours in a certain speed), definition: bearings within this life, in any of its initial fatigue damage to the bearing rings or rolling on (off or defect). In tests in the laboratory or in actual use, however, can be clearly seen, looks the same bearings under the same working conditions, real life vary greatly. In addition there are several different definitions of bearing “life”, one of the so-called “working life”, represents a single row deep groove ball bearings in real life can be achieved before the damage is caused by wear and tear, damage is usually not the fatigue, but rather caused by wear and tear, corrosion, seals damage reasons.

Installation and removal of SKF 623 single row deep groove ball bearings

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Notes
Install bearings in a clean environment. Check the bearing housing, shaft and bearing components to ensure that it is clean.

The bearings should be left in the original packaging until the moment before installation to prevent pollution.

Size and shape tolerances of all components in contact with the bearing should be checked.

The diameter of cylindrical shaft neck, usually uses a micrometer to measure each of the four points of the three planes. Survey record forms can be obtained here. Filling out the measurement records and archives appropriately helps future tracking.

The bore diameter of the cylindrical bearing box, usually uses inner gauge to measure each of the four points of the three planes. Survey record forms can be obtained here. Filling out the measurement records and archives appropriately helps future tracking.

Install Program
Wipe off the rust inhibitor in bearing bore and the cylindrical surface.
If bearings greased and use in extremely high or low temperatures, or grease and rust inhibitors are not compatible, it need to be carefully cleaned and dried.

Axis is an interference fit
Slightly lubricate the hole of the bearing with mineral oil.
Ensure that the bearing is vertical with axis after installed.
When installing, use appropriate sleeve to force on the inner ring.

The bearing box for the interference fit
Slightly lubricate the outer peripheral surface of the bearing with mineral oil.
Ensure that the bearing is vertical with bearing box after installed.
When installing, use the appropriate sleeve to force on outer ring.
Shaft and bearing box for interference fit
Slightly lubricate the inner-hole of the bearing with mineral oil.
Slightly lubricate the outer peripheral surface of the bearing with mineral oil.
Ensure that the shaft and bearing box are perpendicular to the axis after adapted and installed.
When installing, use the appropriate sleeve to force on the inner and outer rings at the same time.
Push the bearing to the correct location.
Fit with locking devices.
Determine shaft or outer ring can easily turn.
Bearings lubricate using oil, pay attention to use the correct lubricants and dosage.
Bearings lubricate using grease, be coupled with the grease.
If the bearing is to be put into the shaft and the bearing box both, grease may needs to earlier be added.
Under normal circumstances, this bearing should be completely filled grease, except applied to high speed. Fill grease in the remaining space in the bearing box (approximately 30-50%).
SKF grease LGMT 2 can be used for the general working conditions. Considering the actual working conditions to select grease, see SKF condensed grease selection guide.

Single row deep groove ball bearings and tolerances

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.

Tolerances

SKF single row deep groove ball bearings are manufactured as standard to Normal tolerances.

SKF Explorer single row deep groove ball bearings are produced to higher precision than the ISO Normal tolerances. The dimensional accuracy corresponds to P6 tolerances, expect the width tolerance, which is considerably tighter and reduced to

–0/–60 μm for bearings with outside diameter up to 110 mm
–0/–100 μm for larger bearings.
The running accuracy depend on the bearing size and corresponds to

–P5 tolerances for bearings up to a 52 mm outside diameter
–P6 tolerances for bearings above 52 mm up to 110 mm outside diameter
–Normal tolerances for larger bearings.
For bearing arrangements where accuracy is a key operational factor, some SKF single row deep groove ball bearings are also available with accuracy completely to P6 or P5 tolerance class specifications. The availability of these bearings should always be checked before ordering.

The tolerances for classes Normal, P6 and P5 are in accordance with ISO 492:2002.

Article Resource:http://www.skf.com/portal/skf/home/products?maincatalogue=1&lang=en&newlink=1_1_1

SKF 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, suitable for high speed, even for very high speed and very durable in operation, almost no maintenance. Deep groove of Bearing Raceway and the high tie between raceways and balls,make deep groove ball bearings can bear radial loads and axial loads in both directions, even at high speeds as well.

SKF single row deep groove ball design

Basic design of SKF single row deep groove ball bearings are open (non-sealed). Because of manufacturing concerns, non-sealed bearings the same size as sealed bearings or dust-proof bearings, might have the seal groove in the outer ring.

SKF single row deep groove ball bearings with normal radial internal clearance as standard. Most bearings with C3 radial internal clearance. Some bearings even with smaller C2 or larger radial internal clearance C4 or C5. In addition, you can provide internal clearance of deep groove ball bearing of the range reduces or offsets. These special clearance can be used to narrow the standard clearance range or adjacent clearance Division, please see the “supplementary designations” designation suffix CN in the next section. On request, can also supply non standard internal clearance of bearings.
Radial internal clearance values are provided in table 3. These values are consistent with ISO 5,753 standards in 1991, apply to bearings before mounting the clearance value when there is no load.
Generally matched bearings
60, 62, and 63 series bearings with axial internal clearance and preload values are shown in table 4.
SKF single row deep groove ball bearings misalignment
Single row deep groove ball bearings withstand the misalignment capacity is limited. The permissible angular displacement between the inner and outer rings (that is not produced in the bearing can ill afford the extra high pressure angular displacement) is given. Depends on:
Due to the complexity of the relationship between these factors, so cannot provide general numerical values. Based on the differential impact of these factors to allow angular displacement of between 2 and 10 arc min. Any misalignment will cause increased bearing noise and reduced life expectancy.
SKF single row deep groove ball bearing cage
Depending on the bearing series and size, SKF single row deep groove ball bearings are fitted with one of the following cages:

Standard design bearings with a pressed steel cage, also equipped with machined brass injection moulded cage of polyamide 6,6. Work at higher temperatures, polyamide 4,6 or PEEK cage may be a significant advantage.
SKF single row deep groove ball bearings with supplementary designations
Used to represent certain features of SKF deep groove ball bearing designation suffix as described in below.
CN General radial clearance; only with the following combination of narrow clearance or transfer letter
These letters are combined with clearance of the following constituencies: C2, C3, C4 and C5, for example C2H.
C2 is smaller than normal clearance of radial internal clearance
C3 is greater than the normal radial internal clearance clearance
C4 is greater than C3 radial internal clearance
C5 is larger than C4 radial internal clearance
DB pair installed in the back to back layout of two single row deep groove ball bearings.
DF in face-to-face pair installed in the layout of two single row deep groove ball bearings.
DT series pair installed in the layout of two single row deep groove ball bearings
E-enhanced ball group
GJN have consistency NLGI 2 grade of polyurea thickener of oils, temperature range from-30 to +150 degrees Celsius (normal padding)
Consistency NLGI 2 grade HT with polyurea thickener of oils, temperature range from-40 degrees Celsius to +150 (normal padding)
J pressed steel cage
LHT23 consistency NLGI grade 2 grade grease of lithium thickener, temperature range from-50 to +140 degrees Celsius (normal padding)
LT consistency NLGI grade 2 grade grease of lithium thickener, temperature range of-55 to +110 degrees Celsius (normal padding)
LT10 consistency NLGI grade 2 grade grease of lithium thickener, temperature range from-50 to +90 degrees Celsius (normal padding)
M-machined brass cage, ball centred. After the m representing a number of different designs and materials, for example, M2
MA machined brass cage, machined
MAS MA, but with lubrication grooves boot
MB machined brass cage, ring centred
MBS with MB, but with lubrication grooves boot
MT33 with consistency NLGI grade 3 grade grease of lithium thickener, temperature range from-30 to +120 degrees Celsius (normal padding)
MT47 with consistency NLGI grade 2 grade grease of lithium thickener, temperature range from-30 to +110 degrees Celsius (normal padding)
N snap rings on the outer ring groove
NR snap rings on the outer ring groove, with open loop
N1 has a Groove on the outer ring side face
P5 tolerances for dimensional accuracy and running accuracy in accordance with ISO 5th grade
P6 tolerances for dimensional accuracy and running accuracy in accordance with ISO 6th grade
P52 P5 + C2
P62 P6 + C2
P63 P6 + C3
RS1 bearing side is equipped with a steel reinforced acrylonitrile-butadiene rubber (NBR) sealing
RSH bearing side is equipped with steel reinforced acrylonitrile-butadiene rubber (NBR) sealing
RSL low friction bearings are fitted with steel reinforcement on one side, and acrylonitrile-butadiene rubber (NBR) sealing
RZ low friction bearings are fitted with steel reinforcement on one side, and acrylonitrile-butadiene rubber (NBR) sealing
TH cage of fabric reinforced phenolic resin (cassette), ball centred
TN injection molding of nylon cage, roller centred
TNH PEEK die cages
TN9 injection moulded cage of glass fibre reinforced polyamide 6,6, ball centred
VL0241 outer ring outside surface coated with aluminum oxide, can block 1000 volts DC
VL2071 outer surface of the inner ring is coated with aluminum oxide, can block 1000 volts DC
Consistency NLGI-class 2-3-class WT polyurea thickener of oils, temperature range from-40 degrees Celsius to +160 (normal padding)
Y pressed brass cage, ball centred
Z z shield on one side of the bearing is equipped with
ZNR bearings with a z shield on one side on the other side, shields have a Groove on the other side and in the outer ring with snap ring
2RS1 ball bearings on both sides of the steel reinforced acrylonitrile-butadiene rubber (NBR) sealing
2RSH bearings on both sides of the sheet steel reinforced low-friction, acrylonitrile-butadiene rubber (NBR) sealing
2RSL bearings on both sides of the sheet steel reinforced low-friction, acrylonitrile-butadiene rubber (NBR) sealing
2RZ bearings on both sides of the sheet steel reinforced low-friction, acrylonitrile-butadiene rubber (NBR) sealing
2Z bearings on both sides with z shields
2ZNR outer ring with snap ring and snap ring, bearings with a z shield on both sides

Ball Bearings come in single and double row versions

Explorer angular contact ball bearings feature ground transition raceways/shoulders and modified polyamide/brass cage geometry. They are manufactured from steel with low oxygen content to prevent formation of fatigue-causing oxide inclusions in steel. Upgraded balls offer running accuracy to ISO P6 and heat-treating process stabilizes rings at 150ºC for minimal dimensional changes. Sealed and shielded units contain high temperature urea base grease.

New SKF® Explorer angular contact ball bearings benefit from advanced design, material, and manufacturing-process innovations. SKF Explorer angular contact ball bearings available in both single- and double-row offer a new performance class for users compared with previous designs. The high-performance single-row angular ball bearings as standard can be universally matched in sets for proper clearance or preload to effect proper load sharing, extend service life, enable easier and safer handling and mounting, and reduce inventory.

Applications for angular contact bearings include electric motors, pumps, compressors, air handling equipment, gearboxes, and other equipment utilized in the packaging, food and beverage, medical, general manufacturing, and construction industries.

Among features and benefits for both the single- and double-row bearings are ground transition raceways/shoulders to deliver higher thrust load capability, lower overall contact stresses, and reduced edge stresses for increased power density, load rating, and safety. Modified polyamide/brass cage geometry promotes higher speed ratings and acceleration, lower heat generation, and reduced vibration and noise. Their manufacture from steel with low oxygen content using state-of-the-art techniques serves to extend life and reduce fatigue failure by preventing formation of fatigue-causing oxide inclusions in the steel.

Upgraded balls offer improved running accuracy to ISO P6 (ABEC 3) as standard and a unique heat-treating process stabilizes rings at 150ºC for minimal dimensional changes (accuracy to ISO P6). Newly developed shields in double-rows can prevent contamination, enhance grease retention, and minimize maintenance. Sealed and shielded bearings contain a high temperature/long life urea base grease compatible with most common industrial greases.

SKF Explorer angular contact ball bearings are available in a wide range of bore sizes and dimensions. Customized bearings can be developed to satisfy particular end-user requirements.

From:http://news.thomasnet.com/fullstory/Ball-Bearings-come-in-single-and-double-row-versions-459585#story-comment

Suffix meanings of SKF single row angular contact ball bearings

A

contact angle 30 °

AC

contact angle 25 °

B

contact angle 40 °

CA

universal distribution groups bearing, in back-to-back or face-to-face when its configurations, axial internal clearance smaller than normal

CB

universal distribution groups bearing, in back-to-back or face-to-face when its configurations, axial clearance for a common group

CC

universal distribution groups bearing, in back-to-back or face-to-face when its configurations, axial internal clearance larger than normal

DB

two back-to-back bearing

DF

two face-to-face bearings

DT

two bearing pairs arranged in tandem

E

optimized internal design

F

machined steel cage

GA

bearing the universal distribution group, in back-to-back or face-to-face when configured with light preload

GB

universal distribution group bearings in back-to-back or face-to-face when configured with preloaded

GC

universal distribution groups bearing, when configured in back-to-back or face-to-face with heavy preload

J

a pressed steel cage, ball Guide

M

machined brass cage, ball Guide, design m with the number of different identities, such as M1

N1

a locating grooves in the outer ring

N2

outer ring with two locating slots, each other into a 180 °

P

plastic cages of glass fibre reinforced polyamide 6,6, ball Guide

P5

Size accuracy and P5 running accuracy in accordance with ISO tolerance class 5

P6

Dimensional precision of the P6 and running accuracy in accordance with ISO tolerance class 6

W64

bearings with solid oil

Y

brass window-type cage of pressed steel cage, ball Guide

Single row deep groove ball bearings and wide use

Single row deep groove ball bearings are with wide range of uses,the most representative structure of rolling bearing. The raceway is located on the inner ring,and outer ring which scroll ball is slightly larger than the RADIUS the radius of circular cross section. Apart from bear racing to meet, it can also withstand axial load in two directions. Frictional moment torque is small, is best suited for high speed rotation, low noise and low vibration. These bearings, apart from outside also has bearings and steel dust cover, plus rubber sealed bearings or bearings with snap ring on the outer ring outside diameter. A pressed window-type steel cages,mainly used in pressed window-type steel cage (waveform, Crown-shaped … Single row; s-… Double column); or phenol-formaldehyde resin for copper alloy, synthetic resin cutting cage cages.

Main use: car: rear wheel, gearbox, electric appliance parts; electric: General Motors, household appliances. Other: instrument, internal combustion engines, construction machinery, railway vehicles, material handling machinery, agricultural machinery,and industrial machinery.

Single row deep groove ball bearings’most widely used bearing type:

1, the basic design open bearings
2, sealed bearing
3, ICOS oil sealed bearing units
4, with a snap ring groove, with or without bearings with snap ring
Other deep groove ball bearings for special applications:
1, hybrid ceramic bearings
2, electric insulated bearing
3, high temperature bearings
4, solid oil bearings
5, sensor bearing

Basic design of SKF single row deep groove ball bearings are open and sealed. Because of manufacturing concerns, or dust with a seal bearing bearing open bearings of the same size, might have on the seal groove in the outer ring. Bearings with shields or seals on both sides are lubricated for life and maintenance free products. This class bearing should not be washed, and temperature must not exceed 80 degrees Celsius.