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

Preload

 

Four-row linear recirculating ball bearing and guideway assemblies are available in preload classes V1 and V2, see table.

 
   
Table 1
Preload classes
 

Preload class1)
Preload setting
Suitable for
V12)
0,04 · C
  • Moderate load
  • High rigidity
    Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

    See Deflection
    requirements
  • Moment load
V2
0,1 · C
  • High alternating load
  • Particularly high rigidity
    Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

    See Deflection
    requirements
  • Moment load

 
 
______
 1    Other preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
classes available by agreement.
 
 
 2    Standard preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
class.
 

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
Force due to negative operating clearance or negative bearing clearance in rolling bearings
also influences the displacement resistance and operating life
See Life, rating
of linear guidance systems.

 
   
   

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
μKUVE
4 to 20
0,0007 to 0,0015

 
   

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 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 18.

 
   

Figure 1
Spring curves for compressive, tensile and lateral load

KUVE15-B
KUVE20-B
KUVE20-B-L
KUVE25-B
KUVE25-B-L
δ = deflection
F = load

 

imageref_582845195_All.gif

 
   

Figure 2
Spring curves for compressive, tensile and lateral load

KUVE30-B
KUVE30-B-L
KUVE35-B
KUVE35-B-L
KUVE45-B
KUVE45-B-L
KUVE55-B
KUVE55-B-L
δ = deflection
F = load

 

imageref_582847371_All.gif

 
   

Figure 3
Spring curves for compressive, tensile and lateral load

KUVE20-B-N
KUVE20-B-NL
KUVE25-B-N
KUVE25-B-NL
δ = deflection
F = load

 

imageref_582849547_All.gif

 
   

Figure 4
Spring curves for compressive, tensile and lateral load

KUVE30-B-N
KUVE30-B-NL
KUVE35-B-N
KUVE35-B-NL
KUVE45-B-N
KUVE45-B-NL
δ = deflection
F = load

 

imageref_582851723_All.gif

 
   

Figure 5
Spring curves for compressive, tensile and lateral load

KUVE15-B-EC
KUVE20-B-EC
KUVE25-B-EC
δ = deflection
F = load

 

imageref_582853899_All.gif

 
   

Figure 6
Spring curves for compressive, tensile and lateral load

KUVE30-B-EC
KUVE35-B-EC
KUVE45-B-EC
δ = deflection
F = load

 

imageref_582856075_All.gif

 
   

Figure 7
Spring curves for compressive, tensile and lateral load

KUVE15-B-H
KUVE25-B-H
KUVE25-B-HL
δ = deflection
F = load

 

imageref_582858251_All.gif

 
   

Figure 8
Spring curves for compressive, tensile and lateral load

KUVE30-B-H
KUVE30-B-HL
KUVE35-B-H
KUVE35-B-HL
KUVE45-B-H
KUVE45-B-HL
δ = deflection
F = load

 

imageref_582860427_All.gif

 
   

Figure 9
Spring curves for compressive, tensile and lateral load

KUVE15-B-S
KUVE20-B-S
KUVE20-B-SL
KUVE25-B-S
KUVE25-B-SL
δ = deflection
F = load

 

imageref_582862603_All.gif

 
   

Figure 10
Spring curves for compressive, tensile and lateral load

KUVE30-B-S
KUVE30-B-SL
KUVE35-B-S
KUVE35-B-SL
KUVE45-B-S
KUVE45-B-SL
KUVE55-B-S
KUVE55-B-SL
δ = deflection
F = load

 

imageref_582864779_All.gif

 
   

Figure 11
Spring curves for compressive, tensile and lateral load

KUVE20-B-SN
KUVE20-B-SNL
KUVE25-B-SN
KUVE25-B-SNL
δ = deflection
F = load

 

imageref_582866955_All.gif

 
   

Figure 12
Spring curves for compressive, tensile and lateral load

KUVE30-B-SN
KUVE30-B-SNL
KUVE35-B-SN
KUVE35-B-SNL
KUVE45-B-SN
KUVE45-B-SNL
δ = deflection
F = load

 

imageref_582869131_All.gif

 
   

Figure 13
Spring curves for compressive, tensile and lateral load

KUVE15-B-ESC
KUVE20-B-ESC
KUVE55-B-ESC
δ = deflection
F = load

 

imageref_582871307_All.gif

 
   

Figure 14
Spring curves for compressive, tensile and lateral load

KUVE30-B-ESC
KUVE35-B-ESC
KUVE45-B-ESC
δ = deflection
F = load

 

imageref_582873483_All.gif

 
   

Figure 15
Spring curves for compressive, tensile and lateral load

KUVE15-B-KT
KUVE15-B-KT-L
KUVE20-B-KT
KUVE20-B-KT-L
KUVE25-B-KT
KUVE25-B-KT-L
δ = deflection
F = load

 

imageref_582875659_All.gif

 
   

Figure 16
Spring curves for compressive, tensile and lateral load

KUVE30-B-KT
KUVE30-B-KT-L
KUVE35-B-KT
KUVE35-B-KT-L
KUVE45-B-KT
KUVE45-B-KT-L
KUVE55-B-KT
KUVE55-B-KT-L
δ = deflection
F = load

 

imageref_582877835_All.gif

 
   

Figure 17
Spring curves for compressive, tensile and lateral load

KUVE15-B-KT-S
KUVE15-B-KT-SL
KUVE20-B-KT-S
KUVE20-B-KT-SL
KUVE25-B-KT-S
KUVE25-B-KT-SL
δ = deflection
F = load

 

imageref_582880011_All.gif

 
   

Figure 18
Spring curves for compressive, tensile and lateral load

KUVE30-B-KT-S
KUVE30-B-KT-SL
KUVE35-B-KT-S
KUVE35-B-KT-SL
KUVE45-B-KT-S
KUVE45-B-KT-SL
KUVE55-B-KT-S
KUVE55-B-KT-SL
δ = deflection
F = load

 

imageref_582882187_All.gif

 
   

Guideway hole patterns

 

Unless specified otherwise, the guideways have a symmetrical hole pattern, Figure 19.

 
 

An asymmetrical hole pattern may be available at customer request. In this case, aL ≧ aL min and aR ≧ aR min, Figure 19.

 
   

Figure 19
Hole patterns of guideways
with one or two rows 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_469218827_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 20.

 
   

Figure 20
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_582888715_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 21 and the 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 21
a
Factor dependent on preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
class, see table
b
 mm
Centre distance between guidance elements.
 
   
Table 3
Factor a
 

Preload class
Factor
a
V11)
0,2
V2
0,1

 
 
______
 1    Standard preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
class.
 
   

Figure 21
Tolerances of mounting surfaces
and parallelism
of mounted guideways

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

 

imageref_582890891_All.gif

 
   

Parallelism
of mounted guideways

 

For guideways arranged in parallel, the parallelism t should be in accordance with Figure 21 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
Designation
Preload class
V1
V2
Parallelism tolerance
t
 μm
 μm
TKVD15-B (-U) 8
5
TKVD20 (-U) 9
6
TKVD25 (-U) 11
7
TKVD30 (-U) 13
8
TKVD35 (-U) 15
10
TKVD45 (-U) 17
12
TKVD55-B (-U) 20
14

 
   

Locating heights and corner radii

 

The locating heights and corner radii should be designed in accordance with the table and Figure 22.

 
   
Table 5
Locating heights, corner radii
 

Four-row linear recirculating ball bearing and guideway assembly
Designation
Locating heights
Corner radii
h1mm
h2mm
r1mm
r2mm
max.
max.
max.
KUVE15-B (-H, -S, -EC, -ESC) 4,5
3,5
1
0,5
KUVE15-B-KT (-L, -H, -HL, -S, -SL) 4,5
3,5
1
0,5
KUVE20-B (-L, -H, -HL, -S, -SL, -SN, -SNL, -N, -NL,-EC, -ESC) 5
4
1
0,5
KUVE20-B-KT (-L, -H, -HL, -S, -SL) 5
4
1
0,5
KUVE25-B (-L, -H, -HL, -S, -SL, -SN, -SNL, -N, -NL,-EC, -ESC) 5
4,5
1
0,8
KUVE25-B-KT (-L, -H, -HL, -S, -SL, -W, -WL) 5
4,5
1
0,8
KUVE30-B (-L, -H, -HL, -S, -SL, -SN, -SNL, -N, -NL,-EC, -ESC) 6
5
1
0,8
KUVE30-B-KT (-L, -H, -HL, -S, -SL) 6
5
1
0,8
KUVE35-B (-L, -H, -HL, -S, -SL, -SN, -SNL, -N, -NL,-EC, -ESC) 6,5
6
1
0,8
KUVE35-B-KT (-L, -H, -HL, -S, -SL) 6,5
6
1
0,8
KUVE45-B (-L, -H, -HL, -S, -SL, -SN, -SNL, -N, -NL,-EC, -ESC) 9
8
1
1
KUVE45-B-KT (-L, -H, -HL, -S, -SL) 9
8
1
1
KUVE55-B (-L, -S, -SL) 12
10
1
1,5
KUVE55-B-KT (-L, -S, -SL) 12
10
1
1,5

 
   

Figure 22
Locating heights and corner radii


 

imageref_582893067_All.gif

 
   
  
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