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Inner rings
 

Inner rings are used where:

 
 
  • the shaft cannot be used as a 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
    raceway for needle roller
    See Rolling element
    and cage
    The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
    assemblies, drawn cup needle roller
    See Rolling element
    bearings with open ends, drawn cup needle roller
    See Rolling element
    bearings with closed end and needle roller
    See Rolling element
    bearings (it cannot be hardened and ground)
  • needle roller bearings must be combined with wider inner rings in order to allow larger axial displacements of the shaft in relation to the housing
    See Mounting dimenstions
    (e.g. in bearings with a non-locating bearing
    Non-locating bearings of the longitudinal, transverse or tilting type permit displacement within the bearing requiring almost no force
    function)
  • optimum running 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
    are required for 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 ➤ Figure 1 and ➤ Figure 4.
 
   

Figure 1
Wider inner ring, outside surface used as raceway for 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

Symbole/00016410_mei_in_0k_0k.gif  Inner ring IR
Symbole/00016411_mei_in_0k_0k.gif  Sealing ring G

 

imageref_22425969419_All.gif

 
 

Product design

 
 

The bearing components are available as:

 
   
 

Inner rings IR

The raceway is precision machined

 

Inner rings IR are made from hardened 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 and have precision machined raceways ➤ Figure 2. Chamfers on the end faces facilitate the matching of the rings with the needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly or of the bearing ring with the needle roller
See Rolling element
set and prevent damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to 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
lips of the bearings. Inner rings are available with and without a 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
hole ➤ Figure 2. Rings with a 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
hole have the suffix IS1 ➤ section , ➤ dimension table.

 
imageref_18348417035_All.gif   Inner rings are also available by agreement with several 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
holes.
 
 

   

Figure 2
Inner rings IR

Symbole/00016410_mei_in_0k_0k.gif  Inner ring without 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
hole
Symbole/00016411_mei_in_0k_0k.gif  Inner ring with 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
hole

 

imageref_22050087051_All.gif

 
 

X-life premium quality

imageref_19964530187_All.gif   Inner rings IR are supplied in the X-life design. The quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
of the inner rings corresponds to the quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
of X-life needle roller
See Rolling element
bearings. X-life inner rings include the suffix XL in the designation ➤ Figure 6.
 
imageref_17757210635_All.gif   X-life indicates a high product performance density
Mass ratio of a lubricant with respect to its volume to DIN 51 757.

Usual units for solid materials (apparent density):
- gramms per cubic centimeter g/cm3

fluids:
- gramms per millilitre g/ml

gases:
- kilogrammes per cubic meter kg/cm3

Other permissible units are kg/dm3, kg/cm3, kg/l
and thus a particularly significant benefit to the customer.
 
 

Inner rings with the machining allowance “z” (special design)

z = a material allowance for finish grinding of the rings after fitting, where there are high demands on running accuracy

 

Inner rings are also available as a special design with a machining allowance “z” on the raceway. These inner rings have the suffix VGS ➤ section . The size of the machining allowance is dependent on the diameter of the inner ring raceway ➤ Table 1. The raceway is finish ground once the rings have been fitted, if high demands are placed on the 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 bearings.

 
   
Table 1
Machining allowance
 

Raceway diameter
F
Machining allowance
z
Preground raceway diameter
FVGS
mm
mm
over
incl.
- 50
0,1
FVGS = F + z
(tolerance h7 Ⓔ)
50
80
0,15
80
180
0,2
180
250
0,25
250
315
0,3
315
400
0,35
400
500
0,4

 
 

Inner rings LR

The raceway is ground

 

Inner rings LR are produced 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 and are hardened ➤ Figure 3. The bore and running surface are ground. The end faces are not ground (turned) and the edges are broken. These rings have larger tolerances
See
Running accuracy
Dimensional accuracy
than the inner rings IR. As a result, they are particularly suitable for applications that allow larger width tolerances
See
Running accuracy
Dimensional accuracy
and less demanding requirements for axial runout. It is here that they give particularly economical bearing arrangements.

 
imageref_18348417035_All.gif   Catalogue HR 1 does not contain separate product tables for inner rings LR. Available inner rings LR are listed in the product tables for drawn cup needler roller bearings with open ends and with closed end ➤ dimension table. For other available dimensions, please consult Schaeffler.  
 

   

Figure 3
Inner ring LR

d =  bore diameter
F =  raceway diameter
B =  width

 

imageref_22051510923_All.gif

 
 

Wider inner rings

 

The inner rings are available in several widths within the respective bore diameters ➤ dimension table. Wider inner rings:

 
 
  • permit larger axial displacements of the shaft in relation to the housing
  • can be used as the running surface for the lips of contact seals, for example when using sealing rings G, GR and SD ➤ Figure 4.
 
 

   

Figure 4
Wider inner ring, also used as running surface for sealing
See Seals
rings

Symbole/00016410_mei_in_0k_0k.gif  Wider inner ring IR
Symbole/00016411_mei_in_0k_0k.gif  Sealing ring G
Symbole/00016412_mei_in_0k_0k.gif  Sealing ring SD

 

imageref_22051513995_All.gif

 
 

Temperature range

 

Limiting values

 

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 inner rings is limited by the dimensional stability of the ring material ➤ Table 2.

 
 

   
Table 2
Permissible temperature ranges
 

Operating temperature
Inner rings
imageref_19988082955_All.gif
   
–30 °C to +120 °C

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

Internal clearance

 

CN for the combination of needler roller bearing/inner ring

 

The radial internal clearance is dependent on the bearing design used in combination with the inner ring. When combined with Schaeffler needle roller
See Rolling element
bearings, inner rings have a radial internal clearance of CN ➤ Table 3.

 

C2 to C3 for the combination of drawn cup needle roller bearing
See Rolling bearing
with open ends or closed end/inner ring

 

When combined with Schaeffler drawn cup needle roller
See Rolling element
bearings with open ends or closed end, inner rings have an internal clearance of C2 to C3, depending on the raceway diameter ➤ Table 3.

 
imageref_17757201419_All.gif   The values for radial internal clearance correspond to DIN 620-4:2004 (ISO 5753-1:2009). 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
 

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.
- 24
0
25
20
45
35
60
50
75
24
30
0
25
20
45
35
60
50
75
30
40
5
30
25
50
45
70
60
85
40
50
5
35
30
60
50
80
70
100
continued ▼

 
   
Table 4
Radial internal clearance
 

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.
50
65
10
40
40
70
60
90
80
110
65
80
10
45
40
75
65
100
90
125
80
100
15
50
50
85
75
110
105
140
100
120
15
55
50
90
85
125
125
165
120
140
15
60
60
105
100
145
145
190
140
160
20
70
70
120
115
165
165
215
160
180
25
75
75
125
120
170
170
220
180
200
35
90
90
145
140
195
195
250
200
225
45
105
105
165
160
220
220
280
225
250
45
110
110
175
170
235
235
300
250
280
55
125
125
195
190
260
260
330
280
315
55
130
130
205
200
275
275
350
315
355
65
145
145
225
225
305
305
385
355
400
100
190
190
280
280
370
370
460
400
450
110
210
210
310
310
410
410
510
continued ▲

 
 

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 inner rings IR 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 5 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 5
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
C2
Radial internal clearance C2
(smaller than normal)
Standard or special design, depending on the 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
used
C3
Radial internal clearance C3
(larger than normal)
C4
Radial internal clearance C4
(larger than C3)
EGS
Surface ground free from spiral marks for rotary shaft 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
to DIN 3760 and DIN 3761
Special design,
available by agreement
IS1
With 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
hole
Standard for IR inner rings within certain limits
VGS
Machining allowance “z” on raceway ➤ Table 1
Special design,
available by agreement

 
 

Structure 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 inner rings follows a set model. Examples ➤ Figure 5 and ➤ Figure 6.

 
   

Figure 5
Inner ring LR: 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_22051517451_en.gif

 
   

Figure 6
Inner ring IR with 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
hole: 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_22051563531_en.gif

 
 

Design of bearing arrangements

 
 

Axial location of inner rings

Always locate inner rings axially on both sides

 

The bearing rings must not be allowed to undergo lateral creep. In order to reliably prevent axial displacements of the inner rings on the shaft where a tight or loose fit is present, these must be located axially on both sides. On one side, the rings can be abutted against a shaft shoulder and, for location on the opposing side, retaining rings, spacer rings or shaft nuts are suitable ➤ Figure 7.

 

Design of adjacent parts

 

The abutment shoulders for the rings should be sufficiently high and perpendicular to the bearing axis. The transition from the bearing seat to the abutment shoulder
Shoulder in the surrounding structure for transfer of forces and location of components.
must be designed with rounding
See Mounting dimensions
to DIN 5418 or an undercut to DIN 509. In this instance, the minimum values for the chamfer dimensions in the product tables must be observed ➤ dimension table. The overlap between the retaining rings and the end faces of the bearing rings must be sufficiently large ➤ Figure 7.

 
imageref_17757201419_All.gif   The maximum chamfer dimensions for the inner rings in accordance with DIN 620-6 must be taken into consideration.  
 

   

Figure 7
Inner ring axially located on both sides

Symbole/00016410_mei_in_0k_0k.gif  Retaining ring
Symbole/00016411_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with open ends HK

Symbole/00016412_mei_in_0k_0k.gif  Shaft shoulder
Symbole/00016413_mei_in_0k_0k.gif  Inner ring IR

 

imageref_22051571979_All.gif

 
 

Mounting and dismounting

 
 

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.  
   
  
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