Schaeffler Product catalogue - medias
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Six-row linear recirculating ball bearing and guideway assemblies
Design and safety guidelines
   

Preload

 

Linear recirculating ball bearing and guideway assemblies KUSE are available in preload classes V1 and V2, see table.

 
   
Table 1
Preload classes
 

Preload class
Preload setting
Suitable for
V1
0,04 · CII1)
  • Moderate load
  • Particularly high rigidity requirements
  • Moment load
V2
0,13 · CII1)
  • High alternating load
  • Particularly high rigidity requirements
  • Moment load

 
 
______
 1    Basic dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
rating of the central rows of balls.
 

Influence of preload
on the linear guidance system

 

Increasing the preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
increases the rigidity.

 
 

However, preload also influences the displacement resistance and operating life of the linear guidance system.

 
   
   

Friction

Table 2
Coefficient of friction
 

The coefficient of friction is dependent on the ratio C/P, see table.

 

Friction

 

Load
C/P
Coefficient of friction
μKUSE
4 to 20
0,001 to 0,002

 
   

Rigidity

 

The spring curves show the deformation
Undesired modification of the form of a solid body due to force.
of linear recirculating ball bearing and guideway assemblies KUSE including the deformation
Undesired modification of the form of a solid body due to force.
of the screw connections to the adjacent construction, Figure 1 to Figure 4.

 
   

Figure 1
Spring curves for compressive, tensile and lateral load

KUSE20
KUSE25
KUSE30
KUSE35
KUSE45
KUSE55
δ = deflection
F = load

 

imageref_574995211_All.gif

 
   

Figure 2
Spring curves for compressive, tensile and lateral load

KUSE20-L
KUSE25-L
KUSE30-L
KUSE35-L
KUSE45-L
KUSE55-L
δ = deflection
F = load

 

imageref_574997387_All.gif

 
   

Figure 3
Spring curves for compressive, tensile and lateral load

KUSE20-H
KUSE25-H
KUSE30-H
KUSE35-H
KUSE45-H
KUSE55-H
δ = deflection
F = load

 

imageref_574999563_All.gif

 
   

Figure 4
Spring curves for compressive, tensile and lateral load

KUSE20-HL
KUSE25-HL
KUSE30-HL
KUSE35-HL
KUSE45-HL
KUSE55-HL
δ = deflection
F = load

 

imageref_575001739_All.gif

 
   

Guideway hole patterns

 

Unless specified otherwise, the guideways have a symmetrical hole pattern, Figure 5.

 
 

An asymmetrical hole pattern may be available at customer request. In this case, aL ≧ aL min and aR ≧ aR min, Figure 5.

 
   

Figure 5
Hole patterns of guideways
with one row of holes

Medias/00015D1F_mei_in_0k_0k.gif Locating face
Medias/00016411_mei_in_0k_0k.gif Symmetrical hole pattern
Medias/00016412_mei_in_0k_0k.gif Asymmetrical hole pattern

 

imageref_522373899_All.gif

 
   

Maximum number of pitches between holes

 

The number of pitches between holes is the rounded whole number equivalent to:

 
 

imageref_316409611_All.gif

 
   
 

The distances aL and aR are generally determined by:

 
 

imageref_316411787_All.gif

 
   
 

For guideways with a symmetrical hole pattern:

 
 

imageref_522376075_All.gif

 
   
 

Number of holes:

 
 

imageref_316416139_All.gif

 
 
aL, aR
 mm
Distance between start or end of guideway and nearest hole
aL min, aR min
mm
Minimum values for aL, aR according to dimension tables
l
mm
Guideway length
n
Maximum possible number of hole pitches
jL
mm
Distance between holes
x
Number of holes.
 
   
achtung  

If the minimum values for aL und aR are not observed, the counterbores of the holes may be intersected.

 
   

Multi-piece guideways

 

If the guideway length required is greater than lmax according to the dimension tables, these guideways are made up from individual pieces that together comprise the total required length. The individual pieces are matched to each other and marked, Figure 6.

 
   

Figure 6
Marking of multi-piece guideways

Medias/00015D21_mei_in_0k_0k.gif Marking
Guideway pieces:
1A, 1A
1B, 1B
1C, 1C
2A, 2A
2B, 2B
2C, 2C

 

imageref_522378251_All.gif

 
   

Demands on the adjacent construction

 

The running 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
is essentially dependent on the straightness, accuracy and rigidity
Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

See Deflection
of the fit and mounting surfaces.

 
 

The straightness of the system is only achieved when the guideway is pressed against the datum surface.

 
 

If high demands are to be made 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
and/or if soft substructures and/or movable guideways are used, please contact us.

 

Geometrical and positional accuracy
of the mounting surfaces

 

The higher the requirements for 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
and smooth running of the guidance system, the more attention must be paid to the geometrical and positional 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 mounting surfaces.

 
   
achtung  

The tolerances according to Figure 7 and table must be observed.

 
 

Surfaces should be ground or precision milled – with the aim of achieving a mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value Ra1,6
.

 
 

Any deviations from the stated tolerances
See
Running accuracy
Dimensional accuracy
will impair the overall accuracy, alter the preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
and reduce the operating life
See Life, rating
of the guidance system.

 
   
   

Height difference ΔH

 

For ΔH, permissible values are in accordance with the following formula. If larger deviations are present, please contact us.

 
 

imageref_467977739_All.gif

 
 
ΔH
 μm
Maximum permissible deviation from the theoretically precise position, Figure 7
a
Factor dependent on preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
class according to the table
b
 mm
Centre distance between guidance elements.
 
   
Table 3
Factor a
 

Preload class
Factor
a
V1
0,2
V2
0,1

 
   

Figure 7
Tolerances of mounting surfaces
and parallelism of mounted guideways

Medias/00016410_mei_in_0k_0k.gif Not convex
(for all machined surfaces)

 

imageref_570259979_All.gif

 
   

Parallelism
of mounted guideways

 

For guideways arranged in parallel, the parallelism t should be in accordance with Figure 7 and the table. If the maximum values are used, the displacement resistance may increase. If larger tolerances
See
Running accuracy
Dimensional accuracy
are present, please contact us.

 
   
Table 4
Values for parallelism tolerances t
 

Guideway
Preload class
Designation
V1
V2
Parallelism tolerance
t
t
μm
μm
TKSD20 (-U) 9
6
TKSD25 (-U) 11
7
TKSD30 (-U) 13
8
TKSD35 (-U) 15
10
TKSD45 (-U) 17
12
TKSD55 (-U) 20
14

 
   

Locating heights and corner radii

 

The locating heights and corner radii should be designed in accordance with the table and Figure 8.

 
   
Table 5
Locating heights and corner radii
 

Six-row linear recirculating ball bearing and guideway assembly
Designation
Locating heights
Corner radii
h1
mm
h2
mm
r1
mm
r2
mm
max.
max.
max.
KUSE20 (-L, -H, -HL) 5
4
1
0,5
KUSE25 (-L, -H, -HL) 5
4,5
1
0,8
KUSE30 (-L, -H, -HL) 6
5
1
0,8
KUSE35 (-L, -H, -HL) 6,5
6
1
0,8
KUSE45 (-L, -H, -HL) 9
8
1
1
KUSE55 (-L, -H, -HL) 12
10
1
1,5

 
   

Figure 8
Locating heights and corner radii


 

imageref_859812619_All.gif

 
   
  
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