Schaeffler Product catalogue - medias
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Deep groove ball bearings
 

Deep groove ball bearings are available in single row and double row designs.

 
 

Single row bearings are particularly suitable where:

 
 
  • high and very high speeds are required
  • the bearing arrangement
    Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
    must be operated with very low friction
  • very low running noise is required, without reducing the speed, load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    carrying capacity and operating life
    See Life, rating
    of the bearing (Generation C) ➤ link
  • high demands are made on the sealing
    See Seals
    of the bearing, without increasing heat generation or limiting the speed (Generation C) ➤ section
  • the bearing position is to be designed particularly economically.
 
 

Double row bearings can be considered for bearing arrangements where:

 
 
  • the load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    carrying capacity of single row deep groove ball bearings is no longer sufficient ➤ link
  • axial loads in both directions and/or tilting
    Deviation from the normal position due to load or geometrical influence

    See Misalignment error
    moments must be supported in addition to radial loads ➤ link
  • a high load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    carrying capacity is required and the design envelope available in a radial and axial direction is relatively small.
 
   

Figure 1
Comparison of standard deep groove ball bearings with bearings of Generation C: running noise, frictional torque

C =  bearings of Generation C
MR =  frictional torque
nG =  limiting speed

 

imageref_19929633163_All.gif

 
 

Bearing design

 
 

Single row deep groove ball bearings are available as:

 
   
 

Double row deep groove ball bearings are available as:

 
   
imageref_18348417035_All.gif   Single row deep groove ball bearings are also available in many other designs and sizes, as well as for specific applications, by agreement. Corrosion-resistant bearings ➤ TPI 64, larger catalogue bearings ➤ GL 1.  
 

Standard bearings

Proven and versatile bearings with high market shares

 

Single row deep groove ball bearings are self-retaining units, which are part of the group of radial ball bearings. The solid outer and inner rings have deep raceway grooves, with shoulders which are not generally interrupted by filling slots ➤ Figure 2. Solid cages made from polyamide PA66 or brass, and sheet metal cages made from steel or brass, are used as standard cages ➤ Table 4. The bearings are open or sealed. Due to the manufacturing processes used, open bearings, which are also available as sealed versions, can have turned recesses in the outer and inner ring for sealing
See Seals
washers or sealing
See Seals
shields.

 
 

Single row deep groove ball bearings are particularly versatile, robust in operation, easy to maintain and very economical. Due to their significant advantages, they are the most widely used rolling bearings worldwide. As a result, Schaeffler also manufactures these bearings in a large number of sizes and designs.

 
 

   

Figure 2
Single row deep groove ball bearings, open or sealed

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Open
Symbole/00016411_mei_in_0k_0k.gif  Sealing shield on both sides (non-contact)
Symbole/00016412_mei_in_0k_0k.gif  Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides

 

imageref_19795474699_All.gif

 
 

Deep groove ball bearings of Generation C

 

Deep groove ball bearings of Generation C correspond in their structure to single row standard deep groove ball bearings, but are specially optimised in relation to:

 
 
  • significantly quieter running
  • even more effective sealing
  • a further reduction in the already very low frictional torque.
 
 

Schaeffler has analysed the causes of noise generation in deep groove ball bearings using the most advanced methods. On the basis of the findings obtained from these analyses:

 
 
  • The surface of the raceways has been improved
  • The ball quality
    See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
    has been increased
  • Osculation has been optimised
  • The production tolerances
    See
    Running accuracy
    Dimensional accuracy
    have been reduced
  • Deep groove ball bearings have been fitted with new riveted cages made from steel.
 
imageref_17757187211_All.gif   The result of this is a noise reduction in Generation C bearings over comparable standard deep groove ball bearings.  

Gen. C = particularly high sealing
See Seals
effect due to new and improved seals

 

The quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
of the seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
not only has a considerable influence on the rating life, but also on the efficiency of a rolling bearing. As a result, the seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
must not only protect the running system reliably against contamination, the ingress of moisture and the loss of grease, but also ensure that the total frictional torque and heat generation in the bearing remain low despite the high sealing
See Seals
action. The new sealing
See Seals
shields, non-contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
and contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
of Generation C deep groove ball bearings (suffixes Z, BRS, HRS, ELS) demonstrate the success of Schaeffler in performing this difficult technical step effectively ➤ Figure 3 and ➤ Figure 4. Description of sealing
See Seals
shields and seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
➤ section .

 
 

Electric motors, electrical machinery, washing machines, ventilators and electric tools are the preferred application areas of single row deep groove ball bearings. However, in order to facilitate further increases in the efficiency of these motors, machines and tools, the power loss occurring in the bearing arrangements must be reduced. The above-mentioned measures for reducing noise also resulted, for example, in an approximate reduction in friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
of 35%, giving the designer a range of application-specific advantages:

 
 
  • lower heat generation
  • a longer grease
    See
    Lubricant
    Grease cartridge
    Fatty acids
    operating life
  • higher possible speeds
  • a longer bearing operating life
  • a reduced energy consumption
  • lower energy costs
  • lower overall cost of the bearing position.
 

Gen. C = a leading player among single row deep groove ball bearings

 

In summary, this means that, in addition to their technical advantages, bearing positions with deep groove ball bearings of Generation C are also considerably more economical than bearing arrangements with single row standard deep groove ball bearings. Generation C is available in series 60, 62 and 63.

 
 

   

Figure 3
Single row deep groove ball bearings, Generation C, open or with non-contact seals

Symbole/00016410_mei_in_0k_0k.gif  Open
Symbole/00016411_mei_in_0k_0k.gif  Sealing shield on both sides (suffix 2Z)
Symbole/00016412_mei_in_0k_0k.gif  Non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (suffix 2BRS)

 

imageref_19795477771_All.gif

 
   

Figure 4
Single row deep groove ball bearings, Generation C, contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction

Symbole/00016410_mei_in_0k_0k.gif  Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (suffix 2HRS)
Symbole/00016411_mei_in_0k_0k.gif  Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (suffix 2ELS)

 

imageref_19795479691_All.gif

 
 

Matched bearing sets

Bearing sets in O, X or tandem arrangements

 

If the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity of a single bearing is not sufficient, or the shaft is to be guided axially in both directions with a defined clearance, single row standard deep groove ball bearings are also available as matched bearing sets ➤ Figure 5.

 
imageref_18348417035_All.gif   As the arrangement of the bearing pairs is specific to the application, Schaeffler supplies bearing sets by agreement.  
 

   

Figure 5
Matched bearing sets

Fr = radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Set in O arrangement
Symbole/00016411_mei_in_0k_0k.gif  Set in X arrangement
Symbole/00016412_mei_in_0k_0k.gif  Set in tandem arrangement

 

imageref_13857975563_All.gif

 
 

Corrosion-resistant bearings

Wide product range

 

Corrosion-resistant bearings are suitable where particular requirements for corrosion protection
Platings and coatings applied to metallic materials to protect against corrosion
are present. Schaeffler supplies deep groove ball bearings of this type in open and sealed designs.

 
imageref_17757187211_All.gif   The load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity for bearings made from corrosion-resistant steel is slightly lower than for bearings made from rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
steel.
 
imageref_17757210635_All.gif   The range of these bearings and housings is described in detail in Technical Product Information TPI 64 ➤ TPI 64.  
 

Double row deep groove ball bearings

imageref_18463839499_All.gif   Double row deep groove ball bearings of series 42 and 43 correspond in their structure and function to single row deep groove ball bearings arranged in pairs ➤ Figure 6. They have deep raceway grooves in the bearing rings and a narrow osculation
Ratio between raceway radius and ball diameter
between the raceway grooves and balls. However, they are slightly narrower than two single row deep groove ball bearings of the series 62 and 63 with the same bore and outside diameter.
 
   

Figure 6
Double row deep groove ball bearing, open

Fr =  radial load
Fa =  axial load

 

imageref_19929652363_All.gif

 
 

Load carrying capacity

 
 

Single row deep groove ball bearings – radial load
A force which acts at an angle of b = 0°.
carrying capacity

Suitable for predominantly radial loads

 

The balls are in contact with the raceways at one point only. Under purely radial load, the contact points between the rolling elements and raceways lie at the centre of the raceway. As a result, the connection between the contact points passes through the radial plane, i.e. the optimum load direction
Effective direction of a load
is a purely radial load ➤ Figure 2.

 

Larger bearing cross-sections permit higher loads

 

The load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity is dependent on the bearing series. As a result, deep groove ball bearings of series 618 and 619, with their smaller bearing cross-sections, cannot support loads as high as series 60, 62 and 63 – with identical dimensions relative to bore diameter d – with their larger cross-sections ➤ Figure 7.

 
 

   

Figure 7
Single row deep groove ball bearings, comparison of cross-section and load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity (radial load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity Cr) for bearings with d = 40 mm

Cr =  basic dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
rating

 

imageref_19929657611_All.gif

 
 

Single row deep groove ball bearings – axial load
Force acting in the direction of the shaft.
carrying capacity

Capable of supporting axial loads in both directions

 

Due to the deep raceway grooves in the bearing rings and the narrow osculation
Ratio between raceway radius and ball diameter
between the raceway grooves and balls, single row deep groove ball bearings can support axial loads in both directions ➤ Figure 2. The axial load
Force acting in the direction of the shaft.
carrying capacity is dependent, for example, on the bearing size, the internal construction and the operating clearance. If the axial load
Force acting in the direction of the shaft.
is too high, however, this can increase the running noise and considerably reduce the operating life
See Life, rating
of the bearings.

 
imageref_18348417035_All.gif   If there is any uncertainty regarding the axial load
Force acting in the direction of the shaft.
carrying capacity of the bearings, please consult Schaeffler.
 
 

Double row deep groove ball bearings

Considerably higher load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity than single row bearings

 

Due to the larger number of rolling elements, double row deep groove ball bearings can be subjected to greater loads than single row deep groove ball bearings with an identical ball set. They can replace two single row deep groove ball bearings if a smaller design envelope width is required.

 

Also suitable for tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
moment loads

 

Double row deep groove ball bearings can also support tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
moment loads in addition to radial and axial loads ➤ Figure 8. They are therefore suitable for particularly short shafts that are supported by only one bearing.

 
 

   

Figure 8
Unilateral bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
of a shaft with a double row deep groove ball bearing (flying bearing arrangement)

Fr =  radial load
Fa =  axial load
M =  tilting moment load

 

imageref_19929662219_All.gif

 
 

Compensation of angular misalignments

 
 

Single row deep groove ball bearings – permissible adjustment angle

The adjustment angle is dependent on the magnitude of the load

 

Single row deep groove ball bearings are only suitable for compensating static angular misalignments to a very limited extent. As a result, the bearing positions must be well aligned. Misalignments shorten the operating life, as they place an additional strain on the bearing. In order to keep these loads at a low level, only small adjustment angles are permissible – dependent on the load – for deep groove ball bearings ➤ Table 1.

 
   
Table 1
Permissible adjustment angles
 

Series
Adjustment angle for
low loads
high loads
62, 622, 63, 623, 64
5′ to 10′
8′ to 16′
618, 619, 160, 60
2′ to 6′
5′ to 10′

 
 

Double row deep groove ball bearings

imageref_17757187211_All.gif   Due to their internal construction, double row deep groove ball bearings do not have an angular adjustment facility. When using these bearings, therefore, misalignments are not permissible.  
 

Lubrication

 
 

Single row deep groove ball bearings

Greased bearings are maintenance-free

 

Deep groove ball bearings sealed on both sides are lubricated with a high quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
with a mineral oil
Oil derived from crude oil and prepared for use as a lubricant by distillation and refining. Chemical composition mainly hydrocarbons.
base, which has good anti‑corrosion characteristics. The grease
See
Lubricant
Grease cartridge
Fatty acids
filling is measured so that it is sufficient for the entire life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
of the bearing. As a result, these bearings are generally maintenance-free.

 
imageref_17757187211_All.gif   Do not wash greased bearings out prior to mounting. If mounting is carried out using thermal tools, the bearings should not be heated to a tem­perature in excess of +80 °C, taking account of the grease
See
Lubricant
Grease cartridge
Fatty acids
filling and seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
material. If higher heating
Controlled heating to approximately 80°C above room temperature by, for example, induction heating equipment electric ovens, heating plates or clean oil baths for easier assembly.
temperatures are required, it must be ensured that the permissible upper temperature limits for grease
See
Lubricant
Grease cartridge
Fatty acids
and seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are not exceeded.
 
  Schaeffler recommends the use of induction heating
Controlled heating to approximately 80°C above room temperature by, for example, induction heating equipment electric ovens, heating plates or clean oil baths for easier assembly.
devices for heating
Controlled heating to approximately 80°C above room temperature by, for example, induction heating equipment electric ovens, heating plates or clean oil baths for easier assembly.
purposes ➤ link .
 

Oil or grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
is possible

 

Open bearings and bearings with seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
on one side are not greased as standard. They must be lubricated with oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
or grease. Lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
is carried out via the end faces of the bearings.

 

Compatibility with plastic cages

 

When using bearings with plastic cages, compatibility between the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
and the cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material must be ensured if synthetic oils, lubricating greases
Consistent grease with a mineral oil and/or synthetic oil base with thickener as well as active ingredients or additives. See DIN 51 825 part 1 for demands on greases, grease type K, operating temperature range -20 to 140°C or DIN 51 825 part 2, for grease type KT.
with a synthetic oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
base or lubricants containing a high proportion of EP additives are used.

 

Observe oil change
See Lubricant change
intervals

 

Aged oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
and additives
Lubricant additive to improve viscosity-temperature behaviour or pour point, prevent corrosion, oxidation or ageing or reduce wear or foaming
in the oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
can impair the operating life
See Life, rating
of plastics at high temperatures. As a result, stipulated oil change
See Lubricant change
intervals must be strictly observed.

 
 

Double row deep groove ball bearings

Open bearings are greased

 

As standard, the bearings are lubricated with a high quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
with a mineral oil
Oil derived from crude oil and prepared for use as a lubricant by distillation and refining. Chemical composition mainly hydrocarbons.
base and are maintenance-free for most applications.

 
 

Sealing

 
 

Single row deep groove ball bearings

The bearings are available in open and sealed designs

 

Single row deep groove ball bearings are available in open designs, as well as with seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
on one or both sides ➤ Figure 2. In the case of sealed bearings, either non-contact or contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are used.

 
 

In the case of unsealed bearings, sealing
See Seals
of the bearing position must be carried out by the adjacent construction. The sealing
See Seals
system should reliably prevent:

 
 
  • moisture and contaminants from entering the bearing
  • the egress of lubricant
    Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
    from the bearing.
 
 

Single row bearings with non-contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
and sealing
See Seals
shields – standard bearings and Generation C

For bearing assemblies with high speeds and lower requirements for sealing

 

Non-contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are particularly suitable for applications with high speeds and high requirements for low inherent heat generation ➤ Table 2. They are free from friction, except for a small amount of lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
in the sealing
See Seals
gap. As a rule, non-contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
do not undergo wear
Undesirable change to dimensions and/or surfaces of materials due to frictional forces
and therefore have an unlimited operating life. Deep groove ball bearings with non-contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
on one or both sides have the suffixes RZ and 2RZ, or BRS and 2BRS; the suffixes Z and 2Z indicate seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
on one or both sides with sealing
See Seals
shields.

 

Z sealing shields  for standard bearings and for bearings of Gen. C

 

Z sealing shields  are made from sheet steel. They sit securely in the outer ring and form a narrow, non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
gap relative to the surface of the inner ring ➤ Table 2. This sealing
See Seals
arrangement is particularly suitable for applications with a rotating inner ring, high to very high speeds and low contamination impact.

 

RZ seals  for standard bearings of series 618 and 619

 

RZ seals  are rubberised sealing
See Seals
washers with a sheet steel reinforcement, which sit securely in the outer ring and form a narrow, non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
gap relative to the surface of the inner ring ➤ Table 2.

 

BRS seals  for bearings of Gen. C

 

BRS seals  are rubberised sealing
See Seals
washers with a sheet steel reinforcement, which sit securely in the outer ring and form a narrow, non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
gap relative to the surface of the inner ring ➤ Table 2. The seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
is securely anchored in the outer ring. A recess incorporated in the inner ring forms a labyrinth in conjunction with the seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
lip, which is filled with grease. The frictional behaviour of this seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
is comparable with that of the Z sealing shield , however, the protection
Coatings and layers on metallic materials to prevent damage from corrosion.
against ingress of dust and egress of lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
is higher.

 
 

Single row bearings with non-contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
– standard bearings and Generation C

For lower speeds and higher requirements for sealing
See Seals
action

 

As these seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are in contact with a defined contact pressure against their sliding surface, they provide very good sealing
See Seals
action against the egress of lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
and ingress of moisture and dust. Attention must, however, be paid to the loss of energy resulting from friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
at the sealing
See Seals
contact. Furthermore, in bearings with contact seals, the bearing speed is restricted by the permissible sliding velocity at the seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
lip, i.e. the speed suitability of these bearings is lower than for open bearings or bearings with non-contact seals.

 

RSR seals , for standard bearings

 

RSR seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are elastomer lip seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
with a sheet steel reinforcement ➤ Table 2. One seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
lip is in radial contact with the inner ring.

 

HRS and ELS seals  for bearings of Gen. C

 

HRS and ELS seals  are securely anchored in a recess in the outer ring. The sealing
See Seals
material is vulcanised onto a sheet steel reinforcement ➤ Table 2. The sealing
See Seals
washer, together with the inner ring, forms an axial sealing
See Seals
system. In addition, the outer non-contact lip forms a protective labyrinth with the inner ring. An additional increase in the sealing
See Seals
action is also provided by the film of grease
See
Lubricant
Grease cartridge
Fatty acids
between the two seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
lips. With this sealing
See Seals
arrangement, higher speeds can be achieved than with conventional RSR seals , as the frictional torque and thus the heat generation in the bearing is lower.

 
imageref_18348417035_All.gif   Generation C deep groove ball bearings with contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are supplied with HRS seals  as standard. ELS seals  are available for these bearings by agreement.
 
 

   
Table 2
Seal characteristics – standard bearings and Generation C
 

Suffix
Type of seal
Seal characteristic
low-friction running
high speeds
sealing integrity against ingress of water
sealing integrity against ingress of dust
sealing integrity against loss of grease
- imageref_19941873291_All.gif
   
open
(without seals)
+++
+++



Z,
2Z
imageref_19941871371_All.gif
   
non-contact
(sheet metal),
for standard bearings and Gen. C
++
+++
o
o
o
RZ,
2RZ
imageref_19942054411_All.gif
   
non-contact (elastomer),
for standard bearings
++
+++
o
o
o
BRS,
2BRS
imageref_19942056331_All.gif
   
non-contact (elastomer),
for Gen. C
++
+++
o
+
+
HRS,
2HRS
imageref_19942058251_All.gif
   
contact
(elastomer),
for Gen. C
o
+
++
++
++
RSR,
2RSR
imageref_19942060171_All.gif
   
contact
(elastomer),
for standard bearings
o
+
+
++
++
ELS,
2ELS
imageref_19942062091_All.gif
   
contact
(elastomer),
for Gen. C
+
++
++
+++
+++

 
 
______
+++ =  excellent
++ =  very good
+ =  good
o =  satisfactory
– =  unsatisfactory
 
 

Double row deep groove ball bearings

The bearings are of an open design

 

Double row deep groove ball bearings are not sealed. As a result, sealing
See Seals
of the bearing position must be carried out by the adjacent construction ➤ section .

 
 

Speeds

 
 

Two speeds are generally indicated in the product tables ➤ dimension table:

 
 
  • the kinematic limiting speed nG
  • the thermal speed rating nϑr.
 
 

Limiting speeds

imageref_17757187211_All.gif   The limiting speed nG is the kinematically permissible speed of the bearing. Even under favourable mounting and operating conditions, this value should not be exceeded without prior consultation with Schaeffler    ➤ link.  
  The values given in the product tables are valid for oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
in the case of bearings without seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
or shields and for grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
where bearings are supplied greased and with seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
or shields.
 

Values for grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication

 

For grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication, 85% of the value stated in the product tables is permissible in each case.

 
 

Reference speeds

nϑr is used to calculate nϑ

 

The thermal speed rating nϑr is not an application-oriented speed limit, but is a calculated ancillary value for determining the thermally safe operating speed nϑ    ➤ link.

 

Bearings with contact seals

 

For bearings with contact seals, no reference speeds are defined in accordance with DIN ISO 15312:2004. As a result, only the limiting speed nG is given in the product tables for these bearings.

 
 

Speeds for bearing sets

imageref_18348417035_All.gif   For matched bearing pairs in an O, X or tandem arrangement, the speed must be limited to approx. 80% of the individual bearings. More accurate speed data for a specific application can be requested from Schaeffler.  
 

Noise

 
 

The Schaeffler Noise Index (SGI) has been developed as a new feature for comparing the noise level of different bearing types and series. As a result, a noise evaluation of rolling bearings can now be carried out for the first time.

 
 

Schaeffler Noise Index

 

The SGI value is based on the maximum permissible noise level of a bearing in accordance with internal standards, which is calculated on the basis of ISO 15242. In order that different bearing types and series can be compared, the SGI value is plotted against the basic static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
rating C0.

 
 

This permits direct comparisons between bearings with the same load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity. The upper limit value is given in each of the diagrams. This means that the average noise level of the bearings is lower than illustrated in the diagram.

 
imageref_17757187211_All.gif   The Schaeffler Noise Index is an additional performance characteristic in the selection of bearings for noise-sensitive applications. The specific suitability of a bearing for an application in terms of installation space, load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity or speed limit for example, must be checked independently of this.
 
 

   

Figure 9
Schaeffler Noise Index for deep groove ball bearings

SGI =  Schaeffler Noise Index
C0 =  basic static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
rating

 

imageref_23598371723_All.gif

 
 

Temperature range

 
 

The operating temperature
A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature.
of the bearings is limited by:

 
 
  • the dimensional stability of the bearing rings and rolling elements
  • the cage
  • the lubricant
  • the seals.
 
 

 

Possible operating temperatures of single row deep groove ball bearings ➤ Table 3.

 
   
Table 3
Permissible temperature ranges
 

Operating temperature
Open deep groove
ball bearings
Sealed deep groove
ball bearings
with brass or
sheet steel cage
with polyamide cage PA66
with seals
BRS, 2BRS
ELS, 2ELS
HRS, 2HRS
RSR, 2RSR
RZ, 2RZ
with gap seals
Z, 2Z
imageref_19988082955_All.gif
   
D ≦ 90 mm,
–30  °C to +120 °C1)
–30 °C to +120 °C
–30 °C to
+110 °C, limited by
the lubricant, cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material and seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
material
–30 °C to +120 °C, limited by
the lubricant, cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material and seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
material
90 mm < D ≦ 240 mm, –30  °C to +150 °C1)
D > 240 mm,
–30  °C to +200 °C1)

 
 
______
 1    By agreement, dimensionally stabilised for higher temperatures.
 
imageref_18348417035_All.gif   In the event of anticipated temperatures which lie outside the stated values, please contact Schaeffler.  
 

Cages

 

Single row bearings: sheet steel or solid brass cages are used as standard

 

Standard cages for single row deep groove ball bearings are made from sheet steel or brass ➤ Table 4. Other cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
designs are available ➤ Table 8. With such cages, however, suitability for high speeds and temperatures as well as the basic load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratings may differ from the values for the bearings with standard cages.

 
 

   
Table 4
Cage, cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix, bore code for single row deep groove ball bearings
 

Bearing series
Sheet steel cage
Sheet brass cage
Solid brass cage
Y
M
Bore code
60
up to 34
- from 36
62
up to 30
- from 32
63
up to 26, 30
- 28, from 32
64
up to 14
- from 15
160
up to 52
- from 56
618
up to 08, 26,
30 to 56
09 to 24,
28
from 60
619
up to 18, 21,
32 to 48
- 26
622
up to 12
- -
623
up to 10
- -

 

Double row bearings

 

Double row deep groove ball bearings have cages made from glass fibre reinforced polyamide PA66.

 
imageref_18348417035_All.gif   For high continuous temperatures and applications with difficult operating conditions, bearings with brass or sheet steel cages should be used. If there is any uncertainty regarding cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suitability, please consult Schaeffler.
 
 

Cages for bearings of Generation C

Riveted sheet metal cages used as standard

 

In bearings of Generation C, a noise-optimised, riveted sheet steel cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
is used as the standard cage. This cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
design does not have a cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix
Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a series
in the bearing designation.

 
imageref_18348417035_All.gif   The bearings are also available with cages made from glass fibre reinforced polyamide PA66 by agreement.  
 

Internal clearance

 
 

Radial internal clearance

The standard is CN

 

Deep groove ball bearings of basic design and bearings of Generation C are manufactured as standard with radial internal clearance CN (normal) ➤ Table 5. CN is not stated in the designation.

 
 

The bearings are also available with the smaller internal clearance C2 and with the larger internal clearance C3 and C4.

 

CM also available for smaller bore diameters

 

Deep groove ball bearings with a bore diameter 10 ≦ d ≦ 50 are also available with the more closely toleranced bearing internal clearance CM (specifically for use in electric motors) ➤ Table 6.

 
imageref_17757201419_All.gif   The values for radial internal clearance (not CM) correspond to DIN 620‑4:2004 (ISO 5753-1:2009). They are valid for bearings which are free from load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
and measurement forces (without elastic deformation).
 
 

   
Table 5
Radial internal clearance of deep groove ball bearings – standard bearings and Gen. C
 

Nominal
bore diameter
Radial internal clearance
d
C2
(Group 2)
CN
(Group N)
C3
(Group 3)
C4
(Group 4)
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
1.5
6
0
7
2
13
8
23


6
10
0
7
2
13
8
23
14
29
10
18
0
9
3
18
11
25
18
33
18
24
0
10
5
20
13
28
20
36
24
30
1
11
5
20
13
28
23
41
30
40
1
11
6
20
15
33
28
46
40
50
1
11
6
23
18
36
30
51
50
65
1
15
8
28
23
43
38
61
65
80
1
15
10
30
25
51
46
71
80
100
1
18
12
36
30
58
53
84
100
120
2
20
15
41
36
66
61
97
120
140
2
23
18
48
41
81
71
114
140
160
2
23
18
53
46
91
81
130
160
180
2
25
20
61
53
102
91
147
180
200
2
30
25
71
63
117
107
163
200
225
2
35
25
85
75
140
125
195
225
250
2
40
30
95
85
160
145
225
250
280
2
45
35
105
90
170
155
245

 
   
Table 6
Radial internal clearance CM
 

Nominal bore diameter
Radial internal clearance
d
CM
mm
μm
over
incl.
min.
max.
10
18
4
11
18
24
5
12
24
30
5
12
30
40
9
17
40
50
9
17

 
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of single row deep groove ball bearings correspond to DIN 625-1:2011. Nominal dimensions of single row deep groove ball bearings ➤ dimension table.  
  The main dimensions of double row deep groove ball bearings correspond to DIN 625-3:2011. Nominal dimensions of double row deep groove ball bearings ➤ dimension table.  
 

Chamfer dimensions

imageref_17757201419_All.gif   The limiting dimensions for chamfer dimensions correspond to DIN 620‑6:2004. Overview and limiting values   ➤ section. Nominal value of chamfer dimension ➤ dimension table.  
 

Tolerances for standard bearings

imageref_17757201419_All.gif   The tolerances
See
Running accuracy
Dimensional accuracy
for the dimensional and running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
of single and double row standard bearings correspond to tolerance class Normal in accordance with ISO 492:2014. Bearings with a higher accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
are available by agreement. Tolerance values in accordance with ISO 492 ➤ Table .
 
imageref_17757187211_All.gif   The width tolerance of matched bearings deviates from the values in the above-mentioned standard ➤ Table 7.  
   
Table 7
Width tolerance of bearing rings in matched bearings
 

Nominal bore diameter
d
Width deviation
tΔBs
mm
μm
over
incl.
U
L
- 18
0
–250
18
50
0
–300
50
80
0
–450
80
120
0
–550
120
180
0
–750
180
250
0
–950
250
315
0
–1050

 
 
______
Tolerance symbols ➤ Table
U =  upper limit deviation
L =  lower limit deviation
 
 

Tolerances for bearings of Generation C

imageref_17757201419_All.gif   The dimensional and running tolerances
See
Running accuracy
Dimensional accuracy
correspond to tolerance class 6 in accordance with ISO 492:2014. Bearings with a higher accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
are available by agreement. Tolerance values in accordance with ISO 492 ➤ Table .
 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 8, ➤ Table 9 and medias interchange http://www.schaeffler.de/std/1D52.

 
imageref_18348417035_All.gif   Further special designs of deep groove ball bearings are available by agreement.  
 

   
Table 8
Suffixes and corresponding descriptions, single row deep groove ball bearings
 

Suffix
Description of suffix
C
Deep groove ball bearing, Generation C
Standard
M
Solid brass cage, ball-guided
MA
Solid brass cage, guided on outer ring rib
Available
by agreement
MB
Solid brass cage, guided on inner ring rib
C2
Radial internal clearance C2 (smaller than normal)
Available
by agreement
C3
Radial internal clearance C3 (larger than normal)
C4
Radial internal clearance C4 (larger than C3)
CM
Radial internal clearance more closely toleranced
than normal
2BRS
Non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (labyrinth seal)
Standard
for Generation C
2HRS
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (lip seal)
Standard
for Generation C
2RSR
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (lip seal)
Standard
2RZ
Non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides
(rubberised gap seal)
Standard
2Z
Non-contact sealing
See Seals
shield on both sides
(sheet metal gap seal)
Standard
BRS
Non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on one side (labyrinth seal)
Available
by agreement
ELS
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on one side (lip seal)
Available
by agreement
for Generation C
2ELS
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (lip seal)
Available
by agreement
for Generation C
RSR
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on one side (lip seal)
Available
by agreement
RZ
Non-contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on one side (rubberised gap seal)
Available
by agreement
TVH
Solid cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
made from glass fibre reinforced polyamide PA66
Available
by agreement
Y
Sheet brass cage
Available
by agreement
Z
Non-contact sealing
See Seals
shield on one side
(sheet metal gap seal)
Available
by agreement
S0
Dimensionally stabilised bearing
for operating temperatures up to +150 °C
Available
by agreement
S1
Dimensionally stabilised bearing
for operating temperatures up to +200 °C
Available
by agreement
S2
Dimensionally stabilised bearing
for operating temperatures up to +250 °C
Available
by agreement

 
   
Table 9
Suffixes and corresponding descriptions, double row deep groove ball bearings
 

Suffix
Description of suffix
B
Modified internal construction
Standard
TVH
Solid cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
made from glass fibre reinforced polyamide PA66
Standard

 
 

Structure of bearing designation

 

Examples of composition of bearing designation

 

The designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
of bearings follows a set model. Examples ➤ Figure 10, ➤ Figure 11 and ➤ Figure 12. The composition of designations is subject to DIN 623-1    ➤ Figure.

 
 

   

Figure 10
Single row deep groove ball bearing, open: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_19796169739_en.gif

 
   

Figure 11
Single row deep groove ball bearing, sealed, Generation C: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_19796171659_en.gif

 
   

Figure 12
Double row deep groove ball bearing, open: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_19929671307_en.gif

 
 

Dimensioning

 
 

Equivalent dynamic bearing load

P = Fr under purely radial load
A force which acts at an angle of b = 0°.
of constant magnitude and direction

 

The basic rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
equation L = (Cr/P)p used in the dimensioning of bearings under dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
assumes a load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
of constant magnitude and direction. In radial bearings, this is a purely radial load Fr. If this condition is met, the bearing load Fr is used in the rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
equation for P (P = Fr).

 

P is a substitute force for combined load
Indication of a force acting in a non-perpendicular direction on the bearing.
Load angle b not equal to 0° or 90°.
and various load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
cases

 

If this condition is not met, a constant radial force must first be determined for the rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
calculation that (in relation to the rating life) represents an equivalent load. This force is known as the equivalent dynamic bearing load P.

 

Fa/Fr ≦ e or Fa/Fr > e

 

The calculation of P is dependent on the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratio Fa/Fr and the calculation factor e ➤ Equation 1 and ➤ Equation 2.

 

Equation 1
Equivalent dynamic load
 
imageref_19670284299_All.gif


Equation 2
Equivalent dynamic load
 
imageref_19671416331_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fr
 N
Radial load
Fa
 N
Axial load
e, X, Y
Factors ➤ Table 10.
 
imageref_17757187211_All.gif   The values in accordance with ➤ Table 10 are valid for normal fits (shaft manufactured to j5 or k5, housing
See Mounting dimenstions
bore manufactured to J6). If the calculation values lie between the stated values (e.g. in the case of 0,4), then read off the table values for 0,3 and 0,5 and determine the intermediate values using linear interpolation.
 
 

   
Table 10
Factors e, X and Y
 

imageref_18014409412107019_All.gif
 
Factor for radial internal clearance
CN
e
X
Y
0,3
0,22
0,56
2
0,5
0,24
0,56
1,8
0,9
0,28
0,56
1,58
1,6
0,32
0,56
1,4
3
0,36
0,56
1,2
6
0,43
0,56
1

 

Legend

 
C0r
 N
Basic static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
rating ➤ dimension table
f0
Factor ➤ dimension table
Fa
 N
Axial load.
 
 

Equivalent static bearing load

F0a/F0r ≦ 0,8 or F0a/F0r > 0,8

 

For deep groove ball bearings under static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
➤ Equation 3 and ➤ Equation 4. The calculation of P0 is dependent on the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratio F0a/F0r and the factor 0,8.

 

Equation 3
Equivalent static load
 
imageref_19675912843_All.gif


Equation 4
Equivalent static load
 
imageref_19675919755_All.gif

Legend

 
P0
 N
Equivalent static bearing load
F0r, F0a
 N
Largest radial or axial load
Force acting in the direction of the shaft.
present (maximum load).
 
 

Static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
safety factor

S0 = C0/P0

 

In addition to the basic rating life L (L10h), it is also always necessary to check the static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
safety factor S0
 ➤ Equation 5.

 

Equation 5
Static Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.See Contact surface safety factor
 
imageref_27021597814984331_All.gif

Legend

 
S0
Static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
safety factor
C0
 N
Basic static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
rating
P0
 N
Equivalent static bearing load.
 
 

Minimum load

 

In order to prevent damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
due to slippage, a minimum radial load
A force which acts at an angle of b = 0°.
of P > C0r/100 is required

 

In order that no slippage occurs between the contact partners, the deep groove ball bearings must be constantly subjected to a sufficiently high load. Based on experience, a minimum radial load
A force which acts at an angle of b = 0°.
of the order of P > C0r/100 is thus necessary. In most cases, however, the radial load
A force which acts at an angle of b = 0°.
is already higher than the requisite minimum load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
due to the weight of the supported parts and the external forces.

 
imageref_18348417035_All.gif   If the minimum radial load
A force which acts at an angle of b = 0°.
is lower than indicated above, please consult Schaeffler.
 
 

Design of bearing arrangements

 

Support bearing rings over their entire circumference and width

 

In order to allow full utilisation of the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity of the bearings and thus also achieve the requisite rating life, the bearing rings must be rigidly and uniformly supported by means of contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
over their entire circumference and over the entire width of the raceway. The seating and contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
should not be interrupted by grooves, holes or other recesses. The accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of mating parts must meet specific requirements ➤ Table 11 to ➤ Table 14.

 
 

Radial location of bearings – fit recommendations

For secure radial location, tight fits are necessary

 

In addition to supporting the rings adequately, the bearings must also be securely located in a radial direction, to prevent creep of the bearing rings on the mating parts under load. This is generally achieved by means of tight fits between the bearing rings and the mating parts. If the rings are not secured adequately or correctly, this can cause severe damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to the bearings and adjacent machine parts. Influencing factors, such as the conditions of rotation, magnitude of the load, internal clearance, temperature conditions, design of the mating parts and the mounting and dismounting options must be taken into consideration in the selection of fits.

 
imageref_17757187211_All.gif   If shock type loads occur, tight fits (transition fit or interference fit) are required to prevent the rings from coming loose at any point. Clearance, transition or interference fits ➤ Table and ➤ Table .  
 

The following information provided in Technical principles must be taken into consideration in the design of bearing arrangements:

 
   
 

Axial location of bearings – location methods

The bearings must also be securely located in an axial direction

 

As a tight fit alone is not normally sufficient to also locate the bearing rings securely on the shaft and in the housing
See Mounting dimenstions
bore in an axial direction, this must usually be achieved by means of an additional axial location or retention method. The axial location of the bearing rings must be matched to the type of bearing arrangement. Shaft and housing
See Mounting dimenstions
shoulders, housing
See Mounting dimenstions
covers, nuts, spacer rings and retaining rings etc., are fundamentally suitable.

 
 

Axial adjustment by means of spring element to reduce noise

Example:
single row deep groove ball bearing,
bearing arrangement in an electric motor

 

If the bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
is to run particularly quietly, this can be achieved economically with commonly available spring elements ➤ Figure 13. The bearings in the figure must only support guidance forces in an axial direction. The inner rings have a tight fit on the shaft and are abutted on the shaft shoulders. The outer rings are mounted with a sliding seat. A spring washer is fitted between the outer ring of the right hand bearing and the cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
collar. The bearings are thus axially adjusted by the tensioned springs. This achieves particularly smooth running.

 
   

Figure 13
Bearing arrangement axially adjusted with a spring washer

Symbole/00016410_mei_in_0k_0k.gif  Deep groove ball bearing
Symbole/00016411_mei_in_0k_0k.gif  Spring washer
Symbole/00016412_mei_in_0k_0k.gif  Cover

 

imageref_9007205740581131_All.gif

 
 

Dimensional, geometrical and running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
of the bearing seats

For bearings with tolerance class Normal, a minimum of IT6 should be provided for the shaft seat and a minimum of IT7 for the housing
See Mounting dimenstions
seat

 

The accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the cylindrical bearing seat on the shaft and in the housing
See Mounting dimenstions
should correspond to the accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the bearing used. For deep groove ball bearings with the tolerance class Normal, the shaft seat should correspond to a minimum of standard tolerance grade IT6 and the housing
See Mounting dimenstions
seat to a minimum of IT7; with tolerance class 6, the shaft seat should correspond to a minimum of IT5 and the housing
See Mounting dimenstions
seat to a minimum of IT6. Guide values for the geometrical and positional tolerances
See
Running accuracy
Dimensional accuracy
of bearing seating surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
➤ Table 11, tolerances t1 to t3 in accordance with   ➤ Figure. Numerical values for IT grades ➤ Table 12.

 
   
Table 11
Guide values for the geometrical and positional tolerances
See
Running accuracy
Dimensional accuracy
of bearing seating surfaces
 

Bearing
tolerance class
Bearing seating surface
Standard tolerance grades to ISO 286-1
(IT grades)
to ISO 492
to DIN 620
Diameter tolerance
Roundness tolerance
Parallelism tolerance
Total axial runout tolerance of abutment shoulder
t1
t2
t3
Normal
PN (P0)
Shaft
IT6 (IT5)
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT4/2
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT4/2
IT4
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
Housing
IT7 (IT6)
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
IT5
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT6/2
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT6/2
6
P6
Shaft
IT5
Circumferential load
IT3/2
Circumferential load
IT3/2
IT3
Point load
IT4/2
Point load
IT4/2
Housing
IT6
Circumferential load
IT4/2
Circumferential load
IT4/2
IT4
Point load
IT5/2
Point load
IT5/2

 
   
Table 12
Numerical values for ISO standard tolerances
See
Running accuracy
Dimensional accuracy
(IT grades) to ISO 286-1:2010
 

IT grade
Nominal dimension in mm
over

3
6
10
18
30
50
80
incl.
3
6
10
18
30
50
80
120
Values in μm
IT3
  2
2,5
2,5
3
4
4
5
6
IT4
  3
4
4
5
6
7
8
10
IT5
  4
5
6
8
9
11
13
15
IT6
  6
8
9
11
13
16
19
22
IT7

   
10
12
15
18
21
25
30
35
continued ▼

 
   
Table 13
Numerical values for ISO standard tolerances
See
Running accuracy
Dimensional accuracy
(IT grades) to ISO 286-1:2010
 

IT grade
Nominal dimension in mm
over
120
180
250
315
400
500
630
 800
incl.
180
250
315
400
500
630
800
1 000
Values in μm
IT3
  8
10
12
13
15
16
18
21
IT4
  12
14
16
18
20
22
25
28
IT5
  18
20
23
25
27
32
36
40
IT6
  25
29
32
36
40
44
50
56
IT7

   
40
46
52
57
63
70
80
90
continued ▲

 
 

Roughness of cylindrical bearing seating surfaces

Ra must not be too high

 

The roughness
Regular or irregular repeat deviation from an ideal geometric profile.
of the bearing seats must be matched to the tolerance class of the bearings. The mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value Ra must not be too high, in order to maintain the interference loss within limits. The shafts must be ground, while the bores must be precision turned. Guide values as a function of the IT grade of bearing seating surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
➤ Table 14.

 
   
Table 14
Roughness values for cylindrical bearing seating surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
– guide values
 

Nominal diameter
of the bearing seat
d (D)
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
for ground bearing seats
Ramax
mm
μm
Diameter tolerance (IT grade)
over
incl.
IT7
IT6
IT5
IT4
- 80
1,6
0,8
0,4
0,2
80
500
1,6
1,6
0,8
0,4
500
1 250
3,21)
1,6
1,6
0,8

 
 
______
 1    For the mounting of bearings using the hydraulic method, a value Ra = 1,6 μm must not be exceeded.
 
 

Mounting dimensions for the contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
of bearing rings

The contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the rings must be of sufficient height

 

The mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
of the shaft and housing
See Mounting dimenstions
shoulders, and spacer rings etc., must ensure that the contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the bearing rings are of sufficient height. However, they must also reliably prevent rotating parts of the bearing from grazing stationary parts. Proven mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
for the radii and diameters of the abutment shoulders are given in the product tables. These dimensions are limiting dimensions (maximum or minimum dimensions); the actual values should not be higher or lower than specified.

 
 

Mounting and dismounting

 
imageref_17757187211_All.gif   The mounting and dismounting options for deep groove ball bearings, by thermal, hydraulic or mechanical methods, must be taken into consideration in the design of the bearing position.  

Ensure that the bearings are not damaged during mounting.

 

Deep groove ball bearings are not separable. In the mounting of non‑separable bearings, the mounting forces must always be applied to the bearing ring with a tight fit.

 
 

Schaeffler Mounting Handbook

Rolling bearings must be handled with great care

 

Rolling bearings are well-proven precision machine elements for the design of economical and reliable bearing arrangements, which offer high operational security. In order that these products can function correctly and achieve the envisaged operating life
See Life, rating
without detrimental effect, they must be handled with care.

 
imageref_21602891659_en.gif   The Schaeffler Mounting Handbook MH 1 gives comprehensive infor­mation about the correct storage, mounting, dismounting and mainten­ance of rotary rolling bearings http://www.schaeffler.de/std/1D53. It also provides information which should be observed by the designer, in relation to the mounting, dismounting and maintenance
Inspection, maintenance and repair of equipment and machines.
of bearings, in the original design of the bearing position. This book is available from Schaeffler on request.
 
 

Legal notice regarding data freshness

 

The further development of products may also result in technical changes to catalogue products

 

Of central interest to Schaeffler is the further development and opti­misation of its products and the satisfaction of its customers. In order that you, as the customer, can keep yourself optimally informed about the progress that is being made here and with regard to the current technical status of the products, we publish any product changes which differ from the printed version in our electronic product catalogue.

 
imageref_18350433803_All.gif   We therefore reserve the right to make changes to the data and illus­trations in this catalogue. This catalogue reflects the status at the time of printing. More recent publications released by us (as printed or digital media) will automatically precede this catalogue if they involve the same subject. Therefore, please always use our electronic product catalogue to check whether more up-to-date information or modification notices exist for your desired product.  
 

Further information

 

In addition to the data in this chapter, the following chapters in Technical principles must also be observed in the design of bearing arrangements:

 
   
   
  
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