Schaeffler Product catalogue - medias
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Four-row linear recirculating ball bearing and guideway assemblies
Features
 

Four-row linear recirculating ball bearing and guideway assemblies represent the most extensive and complex group within the range of monorail guidance systems. They are used where linear guidance systems with 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 rigidity
Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

See Deflection
must move heavy loads with high running 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
as well as low friction. The guidance systems are preloaded and are suitable for long, unlimited stroke lengths.

 
 

Depending on the operating conditions, accelerations up to 150 m/s2 and speeds up to 360 m/min are possible. Where designs are planned with extensive use of accessories and travel speeds >180  m/min, please contact us.

 
 

The units are available in 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
design and with Quad‑Spacers. A guidance system comprises at least one carriage with rolling elements, a guideway and two-piece plastic closing plugs. The four-row linear recirculating ball bearing and guideway assemblies are supplied with initial greasing as standard.

 
   
 

Four-row linear recirculating ball bearing and guideway assemblies are linear guidance systems of X-life quality. They are characterised by improved technological characteristics, increased robustness and a longer operating life.

 
   

Full complement

 

Series KUVE..-B has 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
of balls as rolling elements.

 
 

Since they have the maximum possible number of rolling elements, full complement guidance systems have extremely 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 particularly high rigidity.

 
   

With Quad-Spacers

 

Series KUVE..-B-KT corresponds to the 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
design. In order to prevent noise from recirculation, however, the rolling elements are guided by plastic spacers – known as Quad-Spacers. As a result, these guidance systems run with less noise than 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
variants.

 
 

One Quad-Spacer accommodates two rolling elements each from the compressive and tensile raceway. Since the Quad-Spacers are not connected chain elements, bending and tensile stresses are eliminated, particularly in the return area.

 
   

Figure 1
Quad-Spacers


 

imageref_582797323_All.gif

 
   

Load carrying capacity

 

The rows of balls are in two point contact, in an O arrangement and at a contact angle
See
Operating contact angle
Nominal contact angle
of 45 ° in relation to the raceways.

 
 

The units can support forces from all directions – except in the direction of motion – and moments about all axes, Figure 2.

 
   

Figure 2
Load carrying capacity and contact angle


 

imageref_582799499_All.gif

 
   

Carriages

 

The carriages are supplied in numerous variants. They have saddle plates with hardened and precision ground rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
raceways, in which the balls are recirculated by means of enclosed channels and plastic return elements.

 
 

A generous grease
See
Lubricant
Grease cartridge
Fatty acids
reservoir is provided by means of favourably positioned lubricant pockets in the carriage; see Lubrication, link.

 
   

Guideways

 

The guideways are made from hardened steel and are ground on all faces, the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
raceways are precision ground.

 
   

Located from above or below

 

Guideways TKVD.. (-ADB, -ADB+K) and TKVD..-W are located from above. The through holes have counterbores for the fixing screws.

 
 

Guideways TKVD..-U are located from below by means of threaded blind holes.

 
 

Clamping lugs and clamping strips are used for the location of guideways TKVD..-K.

 
   

With helical teeth

 

Guideways TKVD..-ZHP have right hand helical teeth on the underside and are located from the lateral side.

 
 

In the variant TKVD..-ZHST+SVS, the standard guideway is combined with a toothed rack. n this case, the helical teeth are arranged on the lateral face.

 
   

Slot for covering strip

 

Guideways TKVD..-ADB have a slot for an adhesive bonded steel covering strip (ADB) and guideways TKVD..-ADB+K have a slot with undercut for a clip fit steel covering strip
Strip for covering drilled holes to give a smooth surface
(ADB+K).

 
   

Multi-piece guideways

 

If the required guideway length lmax is greater than the value in the dimension tables, the guideways are supplied in several pieces: see link.

 
   

Sealing

 

Elastic end wipers are fitted to the end pieces of the carriages on both sides to retain the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
within the system.

 
 

Standard sealing strips as well as additional optional upper sealing
See Seals
strips ensure reliable sealing
See Seals
and protect the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
system against contamination, even in demanding environmental conditions, Figure 3.

 
   
achtung  

If the contamination conditions are exceptionally severe, please contact us.

 
   

Lubrication

 

Linear recirculating ball bearing and guideway assemblies KUVE..-B and KUVE..-B-KT are suitable for oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
and grease lubrication and the systems are supplied with initial greasing. They are lubricated via the 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 end piece (on the end face or from the side). The end face lubrication nipple is included in the delivery. 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
nipples for relubrication from the side are available by agreement.

 
 

Due to the integral lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
reservoir in the carriages, the units have extended relubrication intervals, Figure 3. Depending on the application, they may also give maintenance-free operation.

 
   

Figure 3
Lubricant reservoir and sealing

Medias/00016410_mei_in_0k_0k.gif Integral lubricant pockets
with grease reservoir
Medias/00016411_mei_in_0k_0k.gif Standard sealing strip
Medias/00016412_mei_in_0k_0k.gif Optional sealing strip
Medias/00016413_mei_in_0k_0k.gif Elastic wipers on end faces

 

imageref_582801675_All.gif

 
   

Operating temperature

 

Four-row linear recirculating ball bearing and guideway assemblies can be used at operating temperatures from –10 °C to +100 °C.

 
   
   

Standard accessories

Plastic dummy guideway

 

The dummy guideway prevents damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
set if the carriage is removed from the guideway.

 
 

Carriages are always pushed directly from the guideway onto the dummy guideway and must remain there until they are reassembled.

 
   

Plastic closing plugs

 

The plugs close off the counterbores of the guideway holes flush with the surface of the guideway.

 
 

Optionally, brass closing plugs are also available, see Accessories, link.

 
   

Lubrication connectors

 

One lubrication nipple is included loose in the delivery.

 
 

The lateral relubrication holes are open. Once the 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 provided for this purpose is screwed in, the guidance systems can be supplied with lubricant. For protection, the holes are closed off by means of a grub screw.

 
   

Corrosion-resistant designs

 

Four-row linear recirculating ball bearing and guideway assemblies KUVE are also available in corrosion-resistant versions:

 
 
  • with the special coatings Corrotect®, Protect A and Protect B; for a description of the coatings, see pages starting   link
  • made from corrosion-resistant steel, suffix RB; for a description see   link.
 
 

For applications with Corrotect®, please contact us.

 
   
Table 1
Suffixes
for Corrotect®-coated parts
 

With Corrotect® coating
Preassembled unit, guideway only coated
Carriage and guideway separate, carriage or guideway coated
Preassembled unit, carriage and guideway coated
imageref_582803851_All.gif imageref_582806027_All.gif imageref_582803851_All.gif
Suffix
RRFT, RROCT
RRF, RROC
RRF, RROC

 
   

Suffixes

 

Suffixes for available designs: see table

 
   
Table 2
Available designs
 

Suffix
Description
Design
- Standard carriage
Standard
EC
Short carriage
Special design
ESC
Short, narrow carriage
H
High carriage
HL
High, long carriage
L
Long carriage
N
Low carriage
NL
Low, long carriage
S
Narrow carriage
SL
Narrow, long carriage
SN
Narrow, low carriage
SNL
Narrow, low, long carriage
W
Wide carriage
WL
Wide, long carriage
SB
High carriage with lateral threaded fixing holes

 
   
  
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