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Spindle bearings
Features
 

Spindle bearings are single row angular contact ball bearings, comprising solid inner and outer rings and ball and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies with solid window cages. They cannot be dismantled. The bearings are available in open and sealed designs.

 
 

Spindle bearings have restricted tolerances. They are particularly suitable for bearing arrangements with very high requirements for guidance accuracy and high speeds. They have proved extremely suitable for main spindle bearing arrangements in machine tools.

 
 

A detailed description of spindle bearings (designs, calculation, lubrication, speeds, fits) is given in Catalogue AC 41 130, Super Precision Bearings.

 
   

Radial and axial load
Force acting in the direction of the shaft.
capacity

 

The bearings can support axial forces in one direction as well as radial forces. Spindle bearings used in an O or X arrangement
Semi-locating bearing arrangement with contact lines in an X arrangement
can support axial forces in both directions and moments. Bearings in a tandem arrangement can only support axial loads in one direction.

 
 

Spindle bearings are available with a contact angle
See
Operating contact angle
Nominal contact angle
α = 15° (suffix C) or α = 25° (suffix E).

 
   

Standard spindle bearings

 

Standard spindle bearings B70, B719 and B72 have steel balls.

 
   

With ceramic balls

 

Spindle bearings HCB70, HCB719 and HCB72 have balls in standard sizes made from ceramic (hybrid bearings).

 
   

Sealing

 

Spindle bearings B70..-2RSD, B719..-2RSD, B72..-2RSD, HCB70..-2RSD, HCB719..-2RSD and HCB72..-2RSD are sealed on both sides by gap seals.

 
   

Lubrication

 

Sealed bearings are greased with an FAG high performance grease
See
Lubricant
Grease cartridge
Fatty acids
and are maintenance-free.

 
   

High speed spindle bearings

 

High speed spindle bearings HSS70 and HSS719 have smaller steel balls.

 
   

With ceramic balls

 

In addition, high speed spindle bearings HCS70 and HCS719 with ceramic balls (hybrid bearings) are available.

 
 

These four series thus achieve higher speeds, have lower friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
and heat generation, place less strain on the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
and have a longer operating life.

 
   

Sealing

 

The bearings are sealed on both sides by gap seals.

 
 

Open bearings of series HS70 and HS719 as well as HC70 and HC719 are also available.

 
   

Lubrication

 

Sealed bearings are greased with an FAG high performance grease
See
Lubricant
Grease cartridge
Fatty acids
and are maintenance-free.

 
   
   

Further bearing designs

X-life ultra bearings

 

X-life ultra bearings have bearing rings made from a nitrogen-containing, corrosion-resistant steel with a particularly fine structure (prefix X) and ceramic balls. They fulfil very high requirements for speed 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. The bearings have longer 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
compared to conventional bearings. Most series of spindle bearings are available as X-life ultra bearings.

 
   

Direct Lube bearings

 

Where the limits of 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
are reached, the spindle bearing range is supplemented by Direct Lube bearings (DLR). They ensure reliable supply of lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
direct to the contact point via a circumferential annular slot and radial feed holes. DLR bearings can achieve extremely high speeds. They allow economical bearing soloutions since the adjacent construction of the bearing can be of a simpler design.

 
   

Universal designs

 

Spindle bearings of universal design can be fitted in any arrangement or combined in various sets without any loss of performance. The position of the pressure cone is marked on the cylindrical surface of the outer ring.

 
 

Bearings with the suffix UL are designed for slight preload in an X or O arrangement.

 
   
achtung  

The preload is altered by mounting and the operating conditions.

 
   

Ordering data

 

When ordering, the number of individual bearings must be stated.

 
   
   

Operating temperature

   
achtung  

The bearings are suitable for operating temperatures from –30 °C to +100 °C, restricted by 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
or cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material.

 
 

The standard grease
See
Lubricant
Grease cartridge
Fatty acids
for sealed spindle bearings is suitable up to a continuous temperature of +80 °C.

 
 

The operating temperature must be taken into consideration when selecting the lubricant.

 
   

Cages

 

Spindle bearings have solid window cages made from hard fabric (suffix T). The cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
is guided on the outer ring.

 
   
achtung  

Check the chemical resistance 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
or cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material to synthetic greases and lubricants with EP additives.

 
 

Aged oil 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 the cages and seals at high temperatures.

 
 

The oil change intervals must be observed.

 
   

Suffixes

 

Suffixes for available designs: see table.

 
   
Table 1
Available designs
 

Suffix
Description
Design
C
Contact angle 15 °
Standard
E
Contact angle 25 °
H
High preload1)
L
Slight preload1)
M
Moderate preload1)
P4S
Tolerance class P4S
T
Solid window cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
made from hard fabric
UL
Universal design, for example for fitting in pairs, bearing pair has slight preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
in O and X arrangement
2RSD
Spindle bearing with sealing shields on both sides (in series B and HCB)

 
 
______
 1    For preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
values, see Catalogue AC 41 130, Super Precision Bearings.
 
   
  
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