Schaeffler Product catalogue - medias
(0)
Barrel roller bearings
 

Barrel roller bearings are suitable:

 
 
  • for compensating angular misalignments where there is skewing between the outer and inner ring ➤ section
  • where high radial shock type loads occur, as a result of the line contact ➤ section
  • where angular misalignments and high radial loads occur, but speed is not a priority ➤ Figure 1.
 
   

Figure 1
Barrel roller bearing: comparison of 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 with self-aligning ball bearing, compensation of misalignments

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

 

imageref_18521816971_All.gif

 
 

Bearing design

 
 

Barrel roller bearings are available as:

 
   
 

Bearings of basic design

The outer ring has a curved raceway

 

Barrel roller bearings are single row, self-retaining radial roller bearings, which are part of the group of self-aligning bearings. The outer ring has a concave raceway. As a result, the bearings permit the compensation of static and dynamic angular misalignments (skewing between the inner and outer ring) within certain limits ➤ section . The inner ring has a formed raceway for the rolling elements and two rigid ribs. The rollers
Barrel-shaped, tapered or cylindrical rolling elements
are barrel-shaped and are guided between the inner ring ribs. Their outside surface line closely follows the raceway profile of the outer and inner ring. Solid cages made from polyamide PA66 or brass are used ➤ Table 2.

 

The bore is cylindrical or tapered

 

Barrel roller bearings of basic design are available with a cylindrical or tapered bore, as a function of the bore diameter d ➤ Figure 2.

 
imageref_17757201419_All.gif   Bearings with a tapered bore have a bore taper of 1:12 and the suffix K ➤ Table 6.  
 

   

Figure 2
Barrel roller bearings of basic design

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Barrel roller bearing
See Rolling bearing
with cylindrical bore
Symbole/00016411_mei_in_0k_0k.gif  Barrel roller bearing
See Rolling bearing
with tapered bore, bore taper 1:12

 

imageref_17865509259_All.gif

 
 

Bearings with adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve

Ready-to-fit bearing mounting kits facilitate the ordering and mounting of barrel roller bearings

 

Complete bearing mounting kits comprising the bearing of basic design, slotted adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve, tab washer and locknut, are also available for use in the location of barrel roller bearings with a tapered bore on a cylindrical shaft journal (series 202..-K + H, 203..-K + H) ➤ Figure 3. Adapter
An accessory mounted on another element, for example a lubrication adapter
sleeves allow bearings to be located on smooth and stepped shafts. The adapter
An accessory mounted on another element, for example a lubrication adapter
sleeves must also be stated when placing the order. Ordering example ➤ Figure 5.

 
 

   

Figure 3
Barrel roller bearing
See Rolling bearing
with adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Barrel roller bearing
See Rolling bearing
with tapered bore
Symbole/00016411_mei_in_0k_0k.gif  Adapter sleeve
Symbole/00016412_mei_in_0k_0k.gif  Locknut
Symbole/00016413_mei_in_0k_0k.gif  Tab washer

 

imageref_17865511435_All.gif

 
 

Load carrying capacity

 

Suitable for high radial loads

 

The rolling elements are in line contact with the raceways. As a result, barrel roller bearings have a very high radial load
A force which acts at an angle of b = 0°.
carrying capacity ➤ Figure 2. In contrast, they have only a low axial load
Force acting in the direction of the shaft.
carrying capacity.

 
 

Axial 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 bearings with adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve

imageref_17757187211_All.gif   Where bearings with adapter
An accessory mounted on another element, for example a lubrication adapter
sleeves are located on a smooth shaft without a fixed stop (e.g. rigid shoulder), their axial load
Force acting in the direction of the shaft.
carrying capacity is dependent on the friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
between the shaft and the sleeve.
 
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 adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve location method, please consult Schaeffler.
 
 

Compensation of angular misalignments

 

Barrel roller bearings compensate dynamic and static angular misalignments

 

Due to the concave rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
raceway in the outer ring, barrel roller bearings are capable of angular adjustment ➤ section . As a result, they permit skewing between the outer and inner ring within certain limits, without causing damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to the bearings, and can thus compensate misalignments, shaft deflections and housing
See Mounting dimenstions
deformations.

 
 

Permissible adjustment angle

With a rotating inner ring, barrel roller bearings can swivel up to from their central position

 

The magnitude of alignment and angular defects may only be so large when the bearings are mounted 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
of the rolling elements under load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
still lie within the width of the raceway. Under normal operating conditions and with a rotating inner ring, barrel roller bearings can swivel by up to from their central position. The extent to which this value can be used for skewing between the inner and outer ring is, however, essentially dependent on the design of the bearing arrangement.

 
imageref_18348417035_All.gif   If the outer ring rotates or the inner ring undergoes tumbling motion, the angular adjustment facility is smaller. In such cases, please consult Schaeffler.  
 

Lubrication

 

Oil or grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication

 

The bearings are not greased. 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
See
Lubricant
Grease cartridge
Fatty acids
and can be lubricated from the end faces.

 

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.

 
 

Sealing

 
 

Barrel roller bearings are supplied without seals. As a result, sealing
See Seals
of the bearing position must be carried out in 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 position.
 
 

Speeds

 
imageref_17757187211_All.gif   The product tables give the limiting speed nG. This is the kinematically permissible speed of a bearing. Even under favourable mounting and operating conditions, this value should not be exceeded without prior consultation with Schaeffler    ➤ link.  
 

Noise

 
 

Schaeffler Noise Index

 

The Schaeffler Noise Index (SGI) is not yet available for this bearing type    ➤ link. The data for these bearing series will be introduced and updated in stages.

 
 

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.
 
 

Possible operating temperatures of barrel roller bearings ➤ Table 1.

 
   
Table 1
Permissible temperature ranges
 

Operating temperature
Barrel roller bearings
with brass cage
with polyamide cage PA66
imageref_19988082955_All.gif
   
–30 °C to +150 °C,
for D > 120 mm up to +200 °C
–30 °C to +120 °C

 
imageref_18348417035_All.gif   In the event of anticipated temperatures which lie outside the stated values, please contact Schaeffler.  
 

Cages

 
 

Standard cages for barrel roller bearings ➤ Table 2.

 
 

   
Table 2
Cage, cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix, bore code
 

Bearing series
Solid cage
made from polyamide PA66
Solid brass cage
TVP
MB
Bore code
202
up to 16
from 17
203
up to 12
from 13

 
imageref_18348417035_All.gif   For high continuous temperatures and applications with difficult operating conditions, bearings with brass 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.
 
 

Internal clearance

 
 

Radial internal clearance – bearings with cylindrical bore

The standard is CN

 

Barrel roller bearings with cylindrical bore are manufactured as standard with radial internal clearance CN (normal) ➤ Table 3. CN is not stated in the designation.

 
imageref_18348417035_All.gif   Certain sizes are also available by agreement with the smaller internal clearance C2 and with the larger internal clearance C3 and C4.  
 

 

Values for radial internal clearance ➤ Table 3. These 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 3
Radial internal clearance of barrel roller bearings with cylindrical bore
 

Nominal
bore diameter
Radial internal clearance
d
C2
CN
C3
C4
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.

30
2
9
9
17
17
28
28
40
30
40
3
10
10
20
20
30
30
45
40
50
3
13
13
23
23
35
35
50
50
65
4
15
15
27
27
40
40
55
65
80
5
20
20
35
35
55
55
75
80
100
7
25
25
45
45
65
65
90
continued ▼

 
   
Table 4
Radial internal clearance of barrel roller bearings with cylindrical bore
 

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.
100
120
10
30
30
50
50
70
70
95
120
140
15
35
35
55
55
80
80
110
140
160
20
40
40
65
65
95
95
125
160
180
25
45
45
70
70
100
100
130
180
225
30
50
50
75
75
105
105
135
225
250
35
55
55
80
80
110
110
140
250
280
40
60
60
85
85
115
115
145
continued ▲

 
 

Radial internal clearance – bearings with tapered bore

C3 is normally used

 

Barrel roller bearings with tapered bore are normally manufactured with the larger radial internal clearance C3 ➤ Table 5.

 
imageref_18348417035_All.gif   Certain sizes are also available by agreement with the smaller internal clearance C2, with internal clearance CN (normal) and with the larger internal clearance C4.  
 

 

Values for radial internal clearance ➤ Table 5. These 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 barrel roller bearings with tapered bore
 

Nominal
bore diameter
Radial internal clearance
d
C2
CN
C3
C4
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.

30
9
17
17
28
28
40
40
55
30
40
10
20
20
30
30
45
45
60
40
50
13
23
23
35
35
50
50
65
50
65
15
27
27
40
40
55
55
75
65
80
20
35
35
55
55
75
75
95
80
100
25
45
45
65
65
90
90
120
100
120
30
50
50
70
70
95
95
125
120
140
35
55
55
80
80
110
110
140
140
160
40
65
65
95
95
125
125
155
160
180
45
70
70
100
100
130
130
160
180
225
50
75
75
105
105
135
135
165
225
250
55
80
80
110
110
140
140
170
250
280
60
85
85
115
115
145
145
175

 
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of barrel roller bearings correspond to DIN 635‑1:2010. Nominal dimensions of barrel roller 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

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 barrel roller bearings correspond to tolerance class Normal in accordance with ISO 492:2014. Tolerance values in accordance with ISO 492 ➤ Table .
 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 6 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 6
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
C2
Radial internal clearance C2
(smaller than normal)
Special design,
available by agreement
C3
Radial internal clearance C3
(larger than normal)
Normally used for bearings
with tapered bore,
available by agreement
for bearings with cylindrical bore
C4
Radial internal clearance C4
(larger than C3)
Special design,
available by agreement
CN
Radial internal clearance CN
(normal)
Standard for bearings
with cylindrical bore,
available by agreement
for bearings with tapered bore
K
Tapered bore, taper 1:12
Standard
MB
Solid brass cage, guided on inner ring
Standard,
cage material dependent
on bore code
TVP
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

 
 

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 4 and ➤ Figure 5. The composition of designations is subject to DIN 623‑1    ➤ Figure.

 
 

   

Figure 4
Barrel roller bearing
See Rolling bearing
with cylindrical bore:
designation structure


 

imageref_17865513611_en.gif

 
   

Figure 5
Barrel roller bearing
See Rolling bearing
with tapered bore and adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve:
designation structure


 

imageref_17865517579_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.

 
 

 

To calculate P for barrel roller bearings under dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
➤ Equation 1.

 

Equation 1
Equivalent dynamic load
 
imageref_1354799755_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fr
 N
Radial load
Fa
 N
Axial load.
 
 

Equivalent static bearing load

 

For barrel roller bearings subjected to 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 2.

 

Equation 2
Equivalent static load
 
imageref_14224029195_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 3.

 

Equation 3
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/60 is required

 

In order that no slippage occurs between the contact partners, the barrel roller 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/60 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 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. Support can be provided by means of a cylindrical or tapered seating surface ➤ Figure 6 to ➤ Figure 8. 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 7 to ➤ Table 9.

 
 

Radial location – fit recommendations for bearings with cylindrical bore

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 – location methods for bearings with cylindrical bore

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, retaining rings, adapter
An accessory mounted on another element, for example a lubrication adapter
and withdrawal sleeves etc., are fundamentally suitable.

 
 

Location of bearings with tapered bore

Location by means of locknut and tab washer

 

If a bearing with a tapered bore is mounted directly on a tapered journal, the bearing can be axially located with ease using a locknut and tab washer ➤ Figure 6.

 
   

Figure 6
Barrel roller bearing
See Rolling bearing
with tapered bore, mounted directly on the tapered shaft journal

Symbole/00016410_mei_in_0k_0k.gif  Tapered journal with fixing thread
Symbole/00016411_mei_in_0k_0k.gif  Locknut
Symbole/00016412_mei_in_0k_0k.gif  Tab washer

 

imageref_17865520523_All.gif

 
 

Location of bearings by means of adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve

Mounting can be carried out quickly and reliably by means of wrench sets from Schaeffler

 

Barrel roller bearings with a tapered bore can be located easily and with operational reliably on smooth or stepped shafts by means of an adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve ➤ Figure 7. The adapter
An accessory mounted on another element, for example a lubrication adapter
sleeves do not need to be secured on the shaft by any additional means. The bearings can be positioned at any point on smooth shafts. Axial load
Force acting in the direction of the shaft.
carrying capacity of bearing arrange­ments by means of adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve connection ➤ section .

 
   

Figure 7
Barrel roller bearing
See Rolling bearing
with adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve, located on smooth shaft

Symbole/00016410_mei_in_0k_0k.gif  Adapter sleeve
Symbole/00016411_mei_in_0k_0k.gif  Locknut
Symbole/00016412_mei_in_0k_0k.gif  Tab washer

 

imageref_19555951115_All.gif

 
 

Location by means of adapter
An accessory mounted on another element, for example a lubrication adapter
sleeve, axial abutment by means of a support ring

 

If very high axial forces are present, a support ring can also be used to provide axial abutment ➤ Figure 8. In this instance, 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 support ring Ba and db in the product tables must be observed ➤ dimension table.

 
   

Figure 8
Stepped shaft, axial abutment by means of a support ring

Symbole/00016410_mei_in_0k_0k.gif  Adapter sleeve
Symbole/00016411_mei_in_0k_0k.gif  Locknut
Symbole/00016412_mei_in_0k_0k.gif  Tab washer
Symbole/00016413_mei_in_0k_0k.gif  Support ring
Symbole/00016414_mei_in_0k_0k.gif  Shaft shoulder

 

imageref_17865753099_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 cylindrical bearing seats

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 barrel roller 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. 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 7, tolerances t1 to t3 in accordance with   ➤ Figure. Numerical values for IT grades ➤ Table 8.

 
   
Table 7
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


 
   
Table 8
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
18
30
50
80
120
180
250
incl.
30
50
80
120
180
250
315
Values in μm
IT4

   
6
7
8
10
12
14
16
IT5

   
9
11
13
15
18
20
23
IT6

   
13
16
19
22
25
29
32
IT7

   
21
25
30
35
40
46
52

 
 

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 9.

 
   
Table 9
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

 
 

Tolerances for tapered bearing seats

Specifications for tapered bearing seats

 

For bearings located directly on a tapered shaft journal ➤ Figure 6, the data are in accordance with    ➤ Figure.

 
 

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.

 
 

Suitable bearing housings for barrel roller bearings

A large range of housings is available

 

For economical, operationally reliable and easily interchangeable 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
units, the barrel roller bearings can also be combined with Schaeffler bearing housings ➤ Figure 9. These easy-to-fit units fulfil all of the requirements for modern machine and plant designs with favourable maintenance-related characteristics.

 
imageref_19614046091_en.gif   Due to the large number of application areas, an extensive range of split plummer block housings and flanged housings is available for bearings with cylindrical and tapered bores. Detailed information on bearing housings can be found in publication GK 1 http://www.schaeffler.de/std/1D54. This book can be ordered from Schaeffler.  
   

Figure 9
Split plummer block housing
See Mounting dimenstions
with a barrel roller bearing

Symbole/00016410_mei_in_0k_0k.gif  Split plummer block housing SNV
Symbole/00016411_mei_in_0k_0k.gif  Barrel roller bearing

 

imageref_19555953291_All.gif

 
 

Mounting and dismounting

 
imageref_17757187211_All.gif   The mounting and dismounting options for barrel roller 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

 

Barrel roller 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.

 
 

Bearings with tapered bore  – methods for achieving a sufficiently tight fit

 

Bearings with a tapered bore are mounted with a tight fit on the shaft or adapter
An accessory mounted on another element, for example a lubrication adapter
and withdrawal sleeve. The tight fit can be checked:

 
 
  • by measuring the reduction in radial internal clearance or
  • by measuring the axial drive-up distance of the inner ring on the tapered bearing seat.
 
imageref_17757187211_All.gif   The malfunction-free operation of barrel roller bearings presupposes that these have been mounted correctly. An insufficient operating clearance
The amount by which the bearing rings in a fitted bearing can be moved in the radial or axial direction from one extreme position to the other.
or inadequately tight fit on the shaft generally leads to bearing damage.
 
imageref_18348417035_All.gif   If there is any uncertainty regarding the practical application of both methods, Schaeffler must always be consulted.  
 

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:

 
   
   
  
Schaeffler applies cookies to secure an optimal use. With the further use of this website you accept the application of cookies.  Further information