Schaeffler Product catalogue - medias
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Linear guidance systems with linear recirculating ball bearing units
Features
 

These linear guidance systems are constructed using full complement linear recirculating ball bearing units KUVS and guideways TKVD. They have adjustable clearance and are suitable for long, unlimited stroke lengths.

 
 

The linear recirculating ball bearing units can be linked directly to the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
or integrated in a carriage and thus incorporated into the adjacent construction. This allows very flexible solutions with a low section height.

 
 

Since the linear recirculating bearing units are arranged to the sides of the guideway, this gives a large support distance.

 
   

Load carrying capacity

 

The rolling elements are in two point contact
Description of the contact relationship in a ball bearing in which the balls have two points of contact with the raceways
with the raceways and have a contact angle
See
Operating contact angle
Nominal contact angle
of 45°.

 
 

The guidance systems can support forces from all directions – apart from the direction of motion – and moments about all axes, Figure 1.

 
 

Their 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 corresponds approximately to that of the four-row linear recirculating ball bearing and guideway assemblies KUVE, while the rigidity
Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

See Deflection
is somewhat lower.

 
   

Figure 1
Load carrying capacity and contact angle


 

imageref_566873099_All.gif

 
   

Linear recirculating ball bearing units

 

The main body of the linear recirculating ball bearing units is made from hardened and ground steel and has two raceways with profiled ends. It is screw mounted to the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
by means of threaded through holes.

 
 

The balls are recirculated in enclosed channels with plastic return elements. A plastic crosspiece running between the end pieces retains the balls in the main body while the linear recirculating ball bearing unit is not yet mounted.

 
   

Carriage

 

The carriage KWVK..-AL has a saddle plate made from anodised aluminium in which two linear recirculating ball bearing units KUVS are integrated.

 
 

Longer carriages with four linear recirculating ball bearing units are also available by agreement.

 
 

The screw mounting surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the linear recirculating ball bearing units in the saddle plate are precision milled. The carriage can be fixed to the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
using the T-slots for conventional hexagonal nuts and T-bolts.

 
   

Clearance adjustment

 

The bearing clearance of the guidance systems with carriages can be adjusted by three screws on the side of the carriage. The screws press into the back of the linear recirculating ball bearing unit.

 
   

Guideways

 

The guideways are available with raceways on both sides (TKVD32, TKVD42 and TKVD69) or as a half guideway with the raceway on one side (TKVD14 and TKVD19).

 
 

They 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.

 
   

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

 

The linear recirculating ball bearing unit is sealed on all sides by the wipers on the end faces and on the sealing
See Seals
strips which form a gap seal
A contact-free and friction-free seal, for example a sealing shield or end seal of a monorail guidance system
in conjunction with the guideway.

 
   
   

Lubrication

Linear recirculating ball bearing units

 

The linear recirculating bearing units are supplied protected by a wet preservative. They are suitable for oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
and grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication.

 
 

They have 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 on both end faces for lubrication. Relubrication can also be carried out from above via a hole, Figure 2.

 
   

Carriages

 

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 is fitted to each longitudinal side of the carriages. Lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
is pressed into the upper hole of the linear recirculating ball bearing unit through this 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.

 
   

Figure 2
Lubrication from above

Medias/00016410_mei_in_0k_0k.gif Lubrication duct

 

imageref_566875275_All.gif

 
   

Operating temperature

 

Linear recirculating ball bearing units can be used at operating temperatures from –10 °C to +100 °C.

 
   
   

Standard accessories

Plastic closing plugs

 

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

 
   

Corrosion-resistant designs

 

Linear guidance systems with linear recirculating ball bearing units are also available in a corrosion-resistant version with the INA special coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
Corrotect®.

 
 

For applications with Corrotect®, please contact us.

 
   
  
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