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Support Bearings

+ Differential Roller Screws
+ Ballscrews
+ Internal Recirculation
+ High Speed Line
FAQ

As the axial stiffness, as well as the critical speed, can be improved by supporting the screw at both ends by thrust bearings, this method is often used. However, keep in mind, that at least on one end the maximum journal diameter must be smaller than the root diameter of the ballthread.

Otherwise, it will be impossible to mount the nut. Using shrunk bushings at both ends will make it impossible to remove the nut and may result in extra repair costs.

The following table gives examples of typical ballscrew / bearing assemblies. However, it is not possible to cover all combinations in this catalog. Please refer to our engineering service for further information.

Bedding

Ballscrew nominal diameter [mm]

INA-Bearing w/ journal configuration acc. to fig.

top

middle

bottom

16

ZKLN1034

-

ZKLN1242

20

ZKLN1242

-

ZKLN1545

25

ZKLN1747

-

ZKLN2052

32 (Pkleiner gleich5)

ZKLN2557

-

-

32(Pgrößer gleich10)

ZKLN2052

ZKLN2557

-

40(Pkleiner gleich5)

ZKLN3062

-

-

40(Pgrößer gleich10)

-

ZARN3062

-

50(Pkleiner gleich5)

ZKLN4075

-

-

50(Pgrößer gleich10)

-

ZARN4075LTN

-

63(Pkleiner gleich5)

ZKLN5090

-

-

63(Pgrößer gleich10)

ZARN4090LTN

ZARN45105LTN

-

80

-

ZARN50110LTN

-

100

-

ZARN60120LTN

-

This brief overview cannot give a generally valid optimum bearing solution. Radial loads due to drive belt tension or increased axial loads due to pre-tensioning a ballscrew must also be considered. Steinmeyer has CAD software available, which is used by our engineers to select the optimum solution for your individual application.

Miniature ballscrews will usually be supported using thrust bearings on one end, or by using one deep groove ballbearing on each end, which are preloaded against each other. In this case use ballbearings with increased backlash, in order to provide a better contact angle after backlash elimination.

For applications with larger axial forces, it is recommended to use angular contact ballbearings.