Schaeffler Product catalogue - medias
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Axial/radial bearings

Axial angular contact ball bearings

Features
 

Axial/radial bearings YRT, RTC and YRTSpeed and axial angular contact ball bearings ZKLDF are ready-to-fit high precision bearings for high precision applications with combined loads. They can support radial loads, axial loads from both sides and tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
moments without clearance and are particularly suitable for bearing arrangements with high requirements for running accuracy, such as rotary tables, face plates, milling heads and reversible clamps.

 
 

Due to the fixing holes in the bearing rings, the units are very easy to fit.

 
 

The bearings are radially and axially preloaded after fitting.

 
 

The mounting dimensions of all series are identical.

 
   

With angular measuring system

 

Axial/radial bearings are also available with an angular measuring system. The measuring system can measure angles to an 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 a few angular seconds by non-contact, magneto-resistive means.

 
   

Areas of application

 

For standard applications with low speeds and small operating durations, such as indexing tables and swivel type milling heads, the most suitable bearing is generally series YRT, Figure 1. These bearings are available in two axial and radial runout accuracies.

 
 

Where comparatively 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 higher speeds are required, RTC bearings can be used, Figure 1. For higher requirements in accuracy, these bearings are also available with restricted axial runout accuracy.

 
 

For the bearing arrangements of direct drive axes, there is the series  YRTSpeed. Due to their high limiting speeds and very low, uniform frictional torque across the whole speed range, these bearings are particularly suitable for combination with torque motors, Figure 1.

 
 

Axial angular contact ball bearings ZKLDF are particularly suitable for high speed applications with long operating duration, Figure 1. They are characterised by high tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
rigidity, low friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
and low lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
consumption.

 
   

Figure 1
Speed and tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
rigidity

Medias/00016410_mei_in_0k_0k.gif ZKLDF
Medias/00016411_mei_in_0k_0k.gif YRTSpeed
Medias/00016412_mei_in_0k_0k.gif RTC
Medias/00016413_mei_in_0k_0k.gif YRT
nG = limiting speed
ckl = tilting rigidity

 

imageref_56649483_All.gif

 
   

Axial/radial bearings

 

Axial/radial bearings YRT, RTC and YRTSpeed have an axial component and a radial component.

 
 

The axial component comprises an axial needle roller
See Rolling element
or cylindrical roller and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly, an outer ring, L-section ring and shaft locating washer and is axially preloaded after fitting. The radial component is a full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
(YRT, RTC) or cage‑guided, preloaded cylindrical roller set. The outer ring, L-section ring and shaft locating washer have fixing holes.

 
 

The unit is located by means of retaining screws for transport and safe handling.

 
   

Sealing

 

Axial/radial bearings are supplied without seals.

 
   

Lubrication

 

Bearings of series YRT and YRTSpeed are greased using a lithium complex soap grease
See
Lubricant
Grease cartridge
Fatty acids
to GA08 and can be lubricated via the outer ring and L-section ring. Arcanol LOAD150 is suitable for relubrication.

 
 

Bearings of series RTC are greased with Arcanol MULTITOP.

 
   

Axial angular
contact ball bearings

 

Axial angular contact ball bearings ZKLDF comprise a single-piece outer ring, a two-piece inner ring and two ball and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies with a contact angle of 60°. The outer ring and inner ring have fixing holes for screw mounting of the bearing on the adjacent construction.

 
 

The unit is located by means of retaining screws for transport and safe handling.

 
   

Sealing

 

Axial angular contact ball bearings have sealing
See Seals
shields on both sides.

 
   

Lubrication

 

The bearings are greased with a barium complex soap grease
See
Lubricant
Grease cartridge
Fatty acids
to DIN 51825–KPE2K–30 and can be lubricated via the outer ring.

 
   

Operating temperature

 

Axial/radial bearings and axial angular contact ball bearings are suitable for operating temperatures from –30 °C to +120 °C.

 
   

Suffixes

 

Suffixes for available designs: see table

 
   
Table 1
Available designs
 

Suffix
Description
Design
H1 ...
Reduced tolerance on mounting dimension H1
(postscript: H1 with tolerance ± ...)
Restricted tolerance value, see table, link
Special design, available by agreement
H2 ...
Reduced tolerance on mounting dimension H2
(postscript: H2 with tolerance ± ...)
Restricted tolerance value, see table, link
- Axial and radial runout tolerances restricted by 50%
(additional text: axial/radial runout 50%)

 
   

Special designs

 

Available by agreement: For YRT, axial and radial runout tolerance restricted by 50%. Additional text: axial and radial runout 50%.

 
 

For RTC, axial runout tolerance restricted by 50%. Additional text: axial runout 50%.

 
 

For YRT, closer tolerance on mounting dimension H1 and H2. Additional text: H1 with tolerance ± ..., H2 with tolerance ± ... For restricted tolerance value, see table.

 
   
  
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