Schaeffler Product catalogue - medias
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Linear bearings and linear bearing and housing units
Features
 

Linear bearings and linear bearing and housing
See Mounting dimenstions
units are available in the compact, light, heavy duty, machined and plain bearing range. The bearings can support high loads while having a relatively low mass and allow the construction of linear guidance systems with unlimited travel.

 
 

Each series has quite specific characteristics that makes it particularly suitable for certain applications. These may include, for example, requirements for compensation of misalignments, low‑friction running, high accelerations and travel speeds or long operating life.

 
 

The range, which has been constructed and expanded in accordance with a modular concept, provides the best technical and economic solution, in relation to each application, for bearing arrangements with shaft guidance systems.

 
   

Linear bearings

 

Linear ball bearings and linear plain bearings are available in open or closed designs. The open design has a segment cut out and is intended for supported shafts. Several series allow, in conjunction with the corresponding housings, adjustment of the radial clearance in order to achieve clearance-free or preloaded guidance systems.

 
   

Compensation of misalignment

 

Misalignment can be caused by tolerance defects, mounting errors or inaccuracies in the adjacent construction. Linear ball bearings of series KN..-B and KNO..-B can compensate static misalignment
Deviation of an actual line from a theoretical ideal line, for example a bearing axis from the shaft axis; may be due to machining, flexing of shaft or deformation of housing.
of up to ±30′, linear ball bearings of series KS and KSO up to ±40′, Figure 1.

 
 

Due to the self-alignment function, the balls run without difficulty into the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
zone. At the same time, the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
distribution over the whole ball row is more uniform. This leads to smoother running, allows higher accelerations and prevents overloading of the individual balls.

 
 

Overall, this means that the bearings can achieve higher loads and a longer operating life; if necessary, the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
can be designed to be smaller and more economical.

 
   
achtung  

In order to fully utilise the basic load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratings given in the dimension table, the shaft raceway must be hardened (670 HV + 170 HV) and ground. Please observe the information in the section Design of bearing arrangements,   link.

 
   

Figure 1
Compensation of misalignment
Deviation of an actual line from a theoretical ideal line, for example a bearing axis from the shaft axis; may be due to machining, flexing of shaft or deformation of housing.
KN..-B and KS

Medias/00016410_mei_in_0k_0k.gif KN..-B
Medias/00016411_mei_in_0k_0k.gif KS

 

imageref_351347339_All.gif

 
   

Linear bearing
and housing
See Mounting dimenstions
units

 

Linear ball bearings and plain bearings are also available in conjunction with INA housings as complete bearing units. The linear bearing is located in the housing
See Mounting dimenstions
by means of a radial fixing screw to prevent axial displacement.

 
 

The housings are made from a high rigidity, high strength
See Viscosity
aluminium alloy that allows the full 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 of the bearings fitted to be utilised. In the machined series, pressure diecast housings are also available.

 
 

Due to the comparatively low total mass, the units are particularly suitable for reduced mass designs with high loads and where higher accelerations and travel speeds are required.

 
   

Simple location

 

Threaded or counterbored holes in the housing
See Mounting dimenstions
allow straight­forward screw mounting on the adjacent construction, if necessary from below.

 
 

For rapid alignment, the housings have a locating edge. This also prevents distortion of the linear bearings when the housings are being mounted.

 
 

Centring holes allow rapid additional location by dowels on the adjacent construction.

 
   

Housing designs

 

The housings are available in closed design, with a segment cutout and in open, slotted and tandem versions (with and without a centring collar).

 
   

Closed design

 

In this variant, the bearing and housing
See Mounting dimenstions
are closed. High precision standard guidance systems with a fixed enveloping circle can thus be easily achieved.

 
   

With segment cutout

 

Open designs with a segment cutout are used where, in the case of long guidance systems, the shaft must be supported and the bearing arrangement must be highly rigid.

 
   

Slotted design

 

Closed designs and designs with a segment cutout are also available in several series with a slot. Slotted variants are suitable for clearance-free or preloaded guidance systems. The operating clearance is set by means of an adjusting screw.

 
   

Tandem design

 

The tandem version contains two linear bearings. As a result, the units have particularly 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.

 
 

Tandem ball bearing and housing
See Mounting dimenstions
units are available in open and closed designs. Both variants are also available in the named design with a slot.

 
   

With centring collar

 

For special applications, there is also a tandem version with a centring collar for locating bores to H7.

 
   

Highly cost-effective

 

As a result of volume production in large quantities, the complete units are normally considerably more economical than customers’ own designs.

 
   

Sealing

 

The bearings are available in an open version and with contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
on both sides (suffix PP). The end face seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
have two 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
lips; the outer lip prevents the ingress of contamination, the inner lip retains the lubricant in the bearing.

 
   

Lubrication

 

Due to the initial greasing with a high quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
grease
See
Lubricant
Grease cartridge
Fatty acids
and the integral lubricant reservoir, the linear bearings are maintenance-free for many applications; if necessary, however, they can be relubricated.

 
 

Linear ball bearings can be lubricated, depending on the design, via the openings in the outer ring or radial holes arranged in the centre of the bearing.

 
 

In the units, 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
is carried out via a separate 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
nipple in the housing; location of the bearing in the housing
See Mounting dimenstions
and the relubrication devices are thus separate from each other.

 
   

Operating temperature

 

Bearings and housings can be used at operating temperatures from –30 °C to +80 °C.

 
   

Operating limits

 

The table shows the operating limits for linear bearings.

 
 

Once the interrelationships of bearing size and design, load, operating clearance, location of bearings and 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
have been checked, it may be possible in individual cases to use higher values. Please contact us in this case.

 
   
achtung  

Linear bearing and housing units should be allocated in accordance with the linear bearing fitted.

 
   
Table 1
Dynamic values
for linear bearings
 

Acceleration,
speed
Linear bearing series
KH
KN-B
KB
KS
PAB
Acceleration
in m/s2
50
50
50
100
50
Speed
in m/s
2
up to 5
up to 5
up to 5
up to 3

 
   

Suffixes

 

Suffixes for available designs: see table.

 
   
Table 2
Available designs
 

Suffix
Description
Design
PP
Lip seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
on both sides
Standard
PPL
Sealing strips on bearings with segment cutout
Available by agreement
AS
Bearing and unit with relubrication facility
Standard

 
   

Machined range

 

Linear ball bearings of the machined range KB, KBS and KBO and the corresponding linear ball bearing and housing
See Mounting dimenstions
units have high precision and are particularly rigid. They have excellent running characteristics.

 
   

Linear ball bearings

 

Linear ball bearings KB, KBS and KBO comprise a hardened and ground outer ring in which a ball and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly with a plastic cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
is integrated.

 
 

The balls are guided with high precision throughout the return area by a special spring washer. This ensures that the displacement resistance remains uniformly low even under difficult operating conditions and irrespective of the mounting position.

 
 

The series KB is of a closed construction and is designed for use on shafts. KBO has a segment cutout and is used in conjunction with shaft and support rail units. KBS has a slot for adjustment of the radial clearance.

 
   

Seals

 

The bearings have contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
or gap seals.

 
   

Linear ball bearing and housing
See Mounting dimenstions
units

 

Linear ball bearing and housing
See Mounting dimenstions
units of the machined range are available with an integral bearing and, in the tandem version with particularly 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, with two bearings.

 
 

The housings are made from high strength
See Viscosity
aluminium or are pressure diecast.

 
 

The housings are available in a closed design, with a segment cutout for supported shafts and with or without a slot. In designs with a slot, the radial clearance can be adjusted by means of an adjusting screw.

 
 

All series have a locating edge and centring holes for dowel holes.

 
 

The bearings are sealed on both sides, they have an initial greasing and can be relubricated via a 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
nipple in the housing.

 
   
  
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