Schaeffler Product catalogue - medias
Ihre Eingaben des Auswahlassistenten werden im Hintergrund gespeichert, Sie können den Assistenten jederzeit wieder aufrufen.
(0)
Bearings for screw drives
 

General features

 
 

Bearings for screw drives are available as:

 
 
  • axial angular contact ball bearings
  • needle roller/axial cylindrical roller bearings
    • for screw mounting
    • not for screw mounting
  • with accessories
    • seal carrier assembly
    • precision locknuts
    • sockets
    • free-of-charge calculation using BEARINX Easy Ballscrew.
 
 

Axial angular contact ball bearings

 
 

Bearing design

Precision bearings for screw drive bearing arrangements

 

Axial angular contact ball bearings are precision bearings for screw drive bearing arrangements. Depending on the series, they can support radial forces as well as axial forces in one or both directions. 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
protect the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
system against contamination and moisture. For higher speeds, non-contact minimal gap 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
can be used.

 

With and without fixing holes

 

The bearings are available with and without fixing holes in the outer ring. Bearings with holes are screw mounted directly on the adjacent construction. This solution is particularly economical since there is then no need for the locating bore that would otherwise be required or for the bearing cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
with the associated matching work.

 

Available with less stringent tolerances

 

For some areas of application, a bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
of lower precision is often sufficient. For this purpose, bearings with less stringent tolerances
See
Running accuracy
Dimensional accuracy
are available.

 
   

Figure 1
Axial angular contact ball bearings, double row, with fixing holes

Symbole/00016410_mei_in_0k_0k.gif  With 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
or minimal gap seals ZKLF..-2RS, ZKLF..-2Z, ZKLF..-2RS-PE
Symbole/00016411_mei_in_0k_0k.gif  Matched pair ZKLF..-2RS-2AP

 

imageref_23333113355_All.gif

 
   

Figure 2
Axial angular contact ball bearings, double row, without fixing holes

Symbole/00016410_mei_in_0k_0k.gif  With 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
or minimal gap seals ZKLN..-2RS, ZKLN..-2Z, ZKLN..-2RS-PE
Symbole/00016411_mei_in_0k_0k.gif  Matched pair ZKLN..-2RS-2AP

 

imageref_23333115275_All.gif

 
   

Figure 3
Axial angular contact ball bearings, single row, for any combination

Symbole/00016410_mei_in_0k_0k.gif  Without seals 7602, 7603, BSB, BSB..-SU
Symbole/00016411_mei_in_0k_0k.gif  With seals 7602..-2RS, 7603..‑2RS, BSB..-2RS, BSB..‑2Z-SU

 

imageref_23333117195_All.gif

 
   

Figure 4
Angular contact ball bearing unit, with fixing holes

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
or gap seals ZKLR..-2RS, ZKLR..-2Z

 

imageref_23333119115_All.gif

 
   

Figure 5
Axial angular contact ball bearings, double or triple row, flange with flattened areas, with fixing holes

Symbole/00016410_mei_in_0k_0k.gif  Double row, 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
or minimal gap seals ZKLFA..-2RS, ZKLFA..-2Z
Symbole/00016411_mei_in_0k_0k.gif  Triple row, lip seals DKLFA..-2RS

 

imageref_23333121035_All.gif

 

For special requirements

 

Screw drive bearing arrangements are subjected to requirements that often cannot be optimally fulfilled by the design construction of conventional bearings.

 

Wide product range

 

For the design of bearing arrangements that have high accuracy, 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, high rigidity, low friction, are easy to fit and maintenance-free or low-maintenance and are suitable for the highly dynamic operating conditions of threaded spindles, there is a wide range of INA and FAG axial angular contact ball bearings. With this product range, solutions can be found to all the technical and economic demands placed on the bearing arrangements of feed spindles ➤ dimension table.

 

Single row and multiple row designs

 

Axial angular contact ball bearings are available as single, double or triple row ready-to-fit units. They are self-retaining and comprise thick-walled, geometrically stable outer rings, ball and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies and one-piece or two-piece inner rings. In several series, the outer ring has through holes for simple flange mounting of the bearing to the adjacent construction. The bearing rings are matched to each other such that a defined preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
is achieved when the rings are clamped in place using a precision locknut.

 

Axial and radial load
A force which acts at an angle of b = 0°.
capacity

 

Due to the 60° contact angle, the bearings can support high axial forces as well as radial forces.

 

In X or O arrangement

 

In arrangements of multiple row angular contact ball bearings, a distinction is made between O, X and tandem arrangements in relation to the arrangement of contact angles. The arrangement of contact angles has an essential influence on the tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
rigidity
Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

See Deflection
of the bearing position.

 
 

The characteristics of the O arrangement
Bearing arrangement in which the contact lines are in an O arrangement
are:

 
 
  • high tilting
    Deviation from the normal position due to load or geometrical influence

    See Misalignment error
    rigidity
  • higher critical whirling speed of the threaded spindle due to the high tilting
    Deviation from the normal position due to load or geometrical influence

    See Misalignment error
    rigidity
    Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

    See Deflection
    of the bearing position
  • longer rating life
    The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
    under additional radial loads due, for example, to a belt drive.
 
 

The characteristics of the X arrangement
Semi-locating bearing arrangement with contact lines in an X arrangement
are:

 
 
  • low tilting
    Deviation from the normal position due to load or geometrical influence

    See Misalignment error
    rigidity
  • lower critical whirling speed of the threaded spindle
  • shorter rating life
    The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
    under additional radial loads due, for example, to a belt drive.
 
 

X-life premium quality

imageref_19964530187_All.gif   Axial angular contact ball bearings ZKLF and ZKLN are supplied in the X-life design. As a result of increased raceway 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 raceway quality, there is a significant reduction in the stress
Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component
conditions present on the rolling elements and raceways under the same load, compared to the stan­dard bearings. The improved quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
gives reduced friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
in the bearing and lower bearing temperatures; running resistance is lower, less strain is placed on the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
and the grease
See
Lubricant
Grease cartridge
Fatty acids
operating life
See Life, rating
and, where applicable, necessary relubrication intervals are extended. As a result of the lower frictional energy, there is a simultaneous increase in the energy efficiency of the bearing arrangement.
 

Higher 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 and limiting speeds with X-life

 

The basic dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
ratings Ca
of axial angular contact ball bearings in the X-life design are 10% higher than those of the previous standard designs. This leads to a longer rating life L10 or can be used to allow higher loads on the bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
while achieving the same rating life. The lower bearing friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
and associated reduction in heat generation in the bearing permit significantly higher limiting speeds nG grease.

 
 

Temperature range

 

The operating temperature
A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature.
of the bearings is limited by:

 
 
  • the dimensional stability of the bearing rings and rolling elements
  • the cage
  • the lubricant
  • the seals.
 
 

Possible operating temperatures of axial angular contact ball bearings ➤ Table 1.

 
   
Table 1
Permissible temperature range
 

Operating temperature
Axial angular contact ball bearings
from
to
imageref_19988082955_All.gif
   
–30 °C
+120 °C

 
imageref_17757187211_All.gif   The operating temperature
A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature.
influences the dynamic bearing character­istics. The values given in the product tables are based on a room temperature of +20 °C.
 
 

Cages

 

The axial angular contact ball bearings have plastic cages. The cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
design is not indicated in the suffix.

 
 

In axial angular contact ball bearings 7602, 7603 and BSB, the polyamide cages are indicated by the suffix TVP or T.

 
 

Suffixes

 

For a description of the suffixes used in this chapter ➤ Table 2 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 2
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
PE
Bearing design with less stringent tolerances
Standard
T, TVP
Polyamide cage
2AP
Axial angular contact ball bearings,
matched pair (ZKLN, ZKLF)
2RS
Contact 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
on both sides (lip seal)
2Z
Minimal gap seal
A contact-free and friction-free seal, for example a sealing shield or end seal of a monorail guidance system
on both sides
L055
Greased with high performance grease
Arcanol Multitop
SU
Universal bearing; single bearings can be used
in sets in any combination required
HC
Hybrid Ceramic, rings made from rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
steel, balls made from ceramic
Special design, available
by agreement

 
 

Needle roller/axial cylindrical roller bearings

 
 

Bearing design

Double direction

 

These precision bearings are double direction axial cylindrical roller bearings with a radial bearing component.

 

With and without fixing holes

 

The bearings are available with and without fixing holes in the outer ring. Bearings with holes are screw mounted directly on the adjacent construction. The large contact surface
The contact surface between two bodies under load, calculated according to Hertz
and the small pitch of the holes allow a connection to the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
that is extremely rigid and with low tendency to settling. There is therefore no need for the bearing cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
that would otherwise be required to hold the bearing, and the matching work required.

 
 

If the axial abutment of the shaft locating washer is not sufficient or a 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
raceway is required, bearings with a stepped shaft locating washer extended on one side are suitable.

 
   

Figure 6
Needle roller/axial cylindrical roller bearings, for screw mounting

Symbole/00016410_mei_in_0k_0k.gif  ZARF
Symbole/00016411_mei_in_0k_0k.gif  With stepped shaft locating washer extended on one side ZARF..-L

 

imageref_23333142667_All.gif

 
   

Figure 7
Needle roller/axial cylindrical roller bearings, not for screw mounting

Symbole/00016410_mei_in_0k_0k.gif  ZARN
Symbole/00016411_mei_in_0k_0k.gif  With stepped shaft locating washer extended on one side ZARN..-L

 

imageref_23333144587_All.gif

 

Features

 

Needle roller/axial cylindrical roller bearings comprise an outer ring with radial and axial raceways, shaft locating washers, an inner ring, a radial needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly and axial cylindrical roller and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies. The bearings are available with or without fixing holes.

 

Capable of supporting radial and axial loads

 

In addition to radial forces, the bearings can also support axial forces from both directions and tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
moments.

 

Preload and internal clearance

 

The outer ring, inner ring and axial cages are matched to each other such that the bearing is axially clearance-free after preloading by means of an INA precision locknut. The radial internal clearance corresponds to Group 2 in accordance with ISO 5753-1 (DIN 620-4).

 
 

Bearings for screw mounting

Screw mounting of the outer ring: cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
and matching work can be dispensed with

 

Needle roller/axial cylindrical roller bearings ZARF(-L) have holes in the outer ring. These are used for screw mounting directly on the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
or in a radial locating bore. Due to screw mounting of the outer ring, the cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
that would otherwise be required and the matching work can therefore be dispensed with. The bearings are preloaded against the shaft shoulder by means of a locknut AM or ZM(A).

 

With 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
carrier assembly

 

In the interests of a simpler design, a seal carrier assembly DRS is recommended. The 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
carrier assembly is centred on the outer ring and 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
the bearing against external influences.

 
 

Bearings not for screw mounting

Mounting in the housing
See Mounting dimenstions
bore

 

Bearings ZARN(-L) are mounted in the housing
See Mounting dimenstions
bore and the outer ring is located using a cover. They are preloaded against the shaft shoulder by means of a locknut AM or ZM(A).

 

With stepped shaft locating washer

 

ZARN/F..-L has a stepped shaft locating washer extended on one side. These series are used in preference where the shaft locating washer is not adequately supported axially by the shaft shoulder or the bearing unit cannot be sealed on the outside surface of the normal shaft locating washer due to space conditions in the adjacent construction.

 

Heavy series

 

ZARN/F(-L) is also available in a heavy series. This series has a larger cross-section for the same shaft diameter and therefore higher 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.

 
 

Temperature range

 

The operating temperature
A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature.
of the bearings is limited by:

 
 
  • the dimensional stability of the bearing rings and rolling elements
  • the lubricant
  • the seals.
 
 

Possible operating temperatures of needle roller/axial cylindrical roller bearings ➤ Table 3.

 
   
Table 3
Permissible temperature range
 

Operating temperature
Needle roller/axial cylindrical roller bearings
from
to
imageref_19988082955_All.gif
   
–30 °C
+120 °C

 
 

Suffixes

 

For a description of the suffixes used in this chapter ➤ Table 4 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 4
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
L
Stepped shaft locating washer extended on one side
Standard
TVP
Axial bearing cages made from glass fibre reinforced polyamide PA66

 
 

Accessories

 
 

Seal carrier assemblies

Complete sealing
See Seals
sets

 

Seal carrier assemblies DRS are complete sealing
See Seals
sets ➤ Figure 8 that are screw mounted on the outer ring of needle roller/axial cylindrical roller bearings ZARF(-L). They are precisely centred in this position and 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
the bearings against external influences ➤ Figure 9.

 
   

Figure 8
Seal carrier assembly DRS


 

imageref_23336386955_All.gif

 
 

The sealing
See Seals
elements are supplied as a complete set of individual parts and comprise:

 
 
  • a 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
    flange
  • a rotary shaft 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
    to DIN 3760, with an elastomer part made from NBR
  • a gasket
  • hexagonal socket head screws for fixing the carrier to the central washer of the bearing.
 
   

Figure 9
Needle roller/axial cylindrical roller bearing ZARF..-L with 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
carrier assembly

Symbole/00016410_mei_in_0k_0k.gif  Seal carrier assembly DRS
Symbole/00016411_mei_in_0k_0k.gif  Precision locknut ZM or ZMA
Symbole/00016412_mei_in_0k_0k.gif  Rotary shaft 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
to DIN 3760

 

imageref_23335196299_All.gif

 
 

Precision locknuts

Precision locknuts are used in the axial preloading of bearings for screw drives

 

Precision locknuts are used to achieve a defined axial preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
in bearings for screw drives. They are also used where high axial forces must be supported and high axial runout 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 rigidity
Resistance to displacement under load in the elastic deformation area, dependent on bearing clearance and bearing type

See Deflection
are required.

 
   

Figure 10
Precision locknuts

Symbole/00016410_mei_in_0k_0k.gif  For axial clamping AM
Symbole/00016411_mei_in_0k_0k.gif  For radial clamping ZM or ZMA

 

imageref_23336423563_All.gif

 
 

Sockets

 

For simple tightening and loosening of precision locknuts ZM on shafts, the sockets LOCKNUT-SOCKET-KM ➤ Figure 11 are suitable. In combi­nation with the socket AMS, this socket is also suitable for precision locknuts AM. They require less space on the circumference of the locknut than hook wrenches and allow the use of torque wrenches.

 
   

Figure 11
FAG sockets for precision locknuts ZM and sockets AMS

Symbole/00016410_mei_in_0k_0k.gif  Socket AMS
Symbole/00016411_mei_in_0k_0k.gif  Socket LOCKNUT-SOCKET-KM

 

imageref_23336250123_All.gif

 

Secure sockets using a locking pin and rubber washer

 

For increased reliability, FAG sockets should be secured using a locking pin and rubber washer. They therefore have a hole for the locking pin and a groove for the rubber washer. The locking pin and rubber washer are included in the scope of delivery.

 
   
  
Schaeffler applies cookies to secure an optimal use. With the further use of this website you accept the application of cookies.  Further information