Basically, there are two types of preloading:
Characteristics
The drawing shows a spindle where bearing 1 has a fixed location, whereas the outer ring of bearing 2 is free to move axially.
The spring force acts on the outer ring of bearing 2 and results in a permanent preload of both bearings almost independent of speed and temperature factors.
Care must be taken to ensure easy movement of the adjusted outer ring.
Bearings preloaded in this way can be used up to the limiting speed of single bearings if oil lubrication is used.
The spring has to be arranged to be effective in the same direction as the external axial load.
Characteristics
With the spindle shown in the drawing both bearings are paired and mounted stationary in an axial direction.
Bearings arranged like this have a defined axial preload.
The sleeves shown in the drawing must be ground to identical lengths in one setting.
GMN delivers the required bearing pairs with the necessary preload.
The change of the preload under operating conditions has to be considered.
All bearing arrangements shown here can be manufactured on request (depending on volume), or combined from universally matched bearings.
Often, if bearings are subjected to large loads or if a high degree of rigidity is required, three or more bearings are used, assembled in sets as shown here.
The bearing arrangements can be combined from universally matched bearings, or produced specifically in the case of larger lot sizes.
When using a single spring loaded bearing, a minimum preload must be observed to assure positive rotation of the balls and to prevent skidding.
For the calculation of the minimum preload for your application, please get in contact with our
By fitting spacers with matched bearings the following is achieved:
The spacer width should correspond to at least the width of a single bearing.
Care must be taken to ensure good plane parallelism of spacers (see Accuracy of associated components).
Both spacers must be face-ground in one setting.
A change of preload is possible with matched bearings by means of correspondingly ground / matched spacers.
If the spacer on the shaft is smaller than the spacer in the housing, then ...
The necessary dimensions for the spacers in the case of a change of preload for a certain bearing are available as download (Technical specifications "Change of preload L-M-S") or on request.
As standard, GMN spindle ball bearings are matched universally.
All bearings of identical size and the same type of matching can be mounted in pairs or sets in DF, DB or DT arrangements.
Bearings matched in this way are packed in pairs or sets and may not be mixed with bearings from a different box.
The bearings within a set are numbered consecutively.
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