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Bearings for combined loads
 

General features

 
 

Bearings for combined loads are available as:

 
 
  • axial/radial bearings ➤ Figure 1
  • axial angular contact ball bearings ➤ Figure 2
  • axial/radial bearings with incremental angular measuring system, with pitch-coded reference marks ➤ Figure 3
  • axial/radial bearings with absolute value angular measuring system ➤ Figure 4.
 
 

Axial/radial bearings, axial angular contact ball bearings

 
 

Axial/radial bearings YRT, YRTC and YRTS 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.

 

Simple mounting due to fixing holes

 

Due to the fixing holes in the bearing rings, mounting of the units is very simple. After mounting, the bearings are radially and axially preloaded. The mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
of all series are identical.

 
 

Axial/radial bearings YRT, YRTC and YRTS

 

Axial/radial bearings are double direction axial bearings for screw mounting, with a radial guidance bearing. These ready-to-fit, greased units are very rigid, have 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 and run with particularly high accuracy. They can support radial forces, axial forces from both directions and tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
moments free from clearance. The bearings are available in several series ➤ Figure 1.

 
   

Figure 1
Axial/radial bearings

Fr =  radial load
Fa =  axial load
M =  tilting moment
Symbole/00016410_mei_in_0k_0k.gif  For standard applications (YRT, YRTC)
Symbole/00016411_mei_in_0k_0k.gif  For high speeds (YRTS)

 

imageref_23358138251_All.gif

 

YRT and YRTC suitable for low speeds and small operating durations

 

For standard applications with low speeds and small operating durations, such as indexing tables and swivel type milling heads, the most suitable bearings are series YRT and YRTC.

 

YRTS suitable for high speeds with low frictional torque

 

For the bearing arrangements of direct drive axes, there is the series YRTS. 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.

 
 

For higher 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
requirements, both series are also available with restricted axial and radial runout.

 
 

Axial angular contact ball bearings ZKLDF

Suitable for very high speeds and long operating durations

 

Axial angular contact ball bearings ZKLDF are highly suitable for high speed applications with long operating duration ➤ Figure 2. 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 2
Axial angular contact ball bearing ZKLDF

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

 

imageref_23358140171_All.gif

 

Preferred areas of use

 

Axial angular contact ball bearings are particularly suitable for precision applications involving combined loads. Their preferred areas of use are bearing arrangements in rotary tables with a main spindle function, for example in combined milling and turning, as well as in milling, grinding and honing heads and in measurement and testing equipment.

 
 

Axial/radial bearings with incremental angular measuring system

 

Features

 

Axial/radial bearings with an incremental angular measuring system and pitch-coded reference marks comprise an axial/radial bearing YRTCM or YRTSM, each with a dimensional scale, an SRM electronic measuring system and signal leads SRMC ➤ Figure 3. The electronic measuring system SRM comprises two measuring heads, two stacks of shims and an electronic evaluation system ➤ Figure 3. The signal leads for connecting the measuring heads to the electronic evaluation system can be ordered individually in various designs.

 

Equivalent in mechanical terms to series YRT and YRTS

 

Bearings of series YRTM or YRTSM correspond in mechanical terms to axial/radial bearings YRT or YRTS, but are additionally fitted with a magnetic dimensional scale. 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.

 
   

Figure 3
Axial/radial bearing with incremental angular measuring system

Symbole/00016410_mei_in_0k_0k.gif  Measuring heads with shims
Symbole/00016411_mei_in_0k_0k.gif  Connection cable SRMC
Symbole/00016412_mei_in_0k_0k.gif  Electronic evaluation system

 

imageref_23370810507_All.gif

 
 

The measuring system:

 
 
  • allows, due to the rigid connection to the adjacent construction, very good control characteristics (control stability and dynamics) and is therefore particularly suitable for axes with torque motor drive
  • offers a high maximum measuring speed of up to 16,5 m/s
  • operates by non-contact means and is therefore not subject to wear
  • carries out measurement irrespective of tilting
    Deviation from the normal position due to load or geometrical influence

    See Misalignment error
    and position
  • has automatically self-adjusting electronics
  • has a self-centring function
  • is unaffected by lubricants
  • is easy to fit, the measuring heads are easily adjustable, there is no need for alignment of the bearing and a separate measuring system
  • requires no additional parts
    • the dimensional scale and measuring heads are integrated in the bearings and adjacent construction
      The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
      respectively
    • the resulting space saved can be used for the machining area of the machine
  • does not give any problems relating to supply cables. The cables can be laid within the adjacent construction
    The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
    directly through the large bearing bore
  • gives savings on components, overall design envelope and costs due to the compact, integrated design requiring fewer components.
 
 

Axial/radial bearings with absolute value angular measuring system

 

Equivalent in mechanical terms to series YRT and YRTS

 

Axial/radial bearings with absolute value angular measuring system YRTCMA and YRTSMA correspond in mechanical terms to series YRT and YRTS, but are additionally fitted with an absolute value angular measuring system ➤ Figure 4.

 
   

Figure 4
Axial/radial bearing with absolute value angular measuring system


 

imageref_23358142091_All.gif

 

High system measuring 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 angular measuring systems integrated in the bearing

 

The ideal location for mounting a measuring system is directly in the bearing arrangement, which means that higher system accuracies can be achieved with measuring systems integrated in the bearing than with measuring systems that are attached to the axis a significant distance from the relevant bearing arrangement. The very precise radial runout of the precision rotary axis bearing YRT(S)MA is utilised here.

 
 

The absolute angular measuring system integrated directly in the bearing offers considerable advantages:

 
 
  • an absolute interface, dispensing with the need for reference travel
  • a hollow shaft design, freeing up the centre of the machine for other components
  • the facility for highly dynamic and precise control loops
  • savings in terms of design envelope
  • simplifications in design and mounting
  • resistance to environmental influences, lubricants and cooling lubricants.
 

Inductive measurement method ABSYS (AMO)

 

The inductive measurement method ABSYS (AMO) is based on contact-free scanning of a structured dimensional scale that is applied directly as a measurement ring to the bearing inner ring ➤ Figure 5. The irregular structure with absolute coding is captured on a bitwise inductive basis by a coil arrangement that is integrated in the measuring head.

 
 

The binary value obtained, which occurs only once per angular position within the entire measurement range, is converted into an absolute angular value by a microcontroller using a conversion table.

 
imageref_18348417035_All.gif   The electronic evaluation system is integrated in the measuring head, so the system can be connected directly to the controller. The measuring head is configured such that no adjustment of the measurement gap is required and 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
chamber is protected against the egress and ingress of lubricants and other media. Other measuring head designs are available by agreement.
 
 

   

Figure 5
Absolute value angular measuring system

Symbole/00016410_mei_in_0k_0k.gif  Measuring head
Symbole/00016411_mei_in_0k_0k.gif  Measurement ring
Symbole/00016412_mei_in_0k_0k.gif  Inner ring of axial/radial bearing

 

imageref_23358148619_All.gif

 
   
  
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