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Axial load capacity of radial insert ball bearings and housing bearing units

Axial load capacity of radial insert ball bearings and housing bearing units

Radial insert ball bearings are primarily designed for radial loads. In addition, they can withstand axial loads, but the axial load capacity is well below the radial load capacity. In order to achieve the maximum axial load capacity of the bearing insert, the following points should be noted:

Mounting types

Radial insert ball bearings are inserted in a housing and must be mounted on the shaft. The amount of axial load capacity depends on the type of attachment of the radial insert ball bearing on the shaft. The following fixings are common:

  • by means of a adapter sleeve — normal load capacity
  • with grub screws in an extended inner ring or eccentric collar — normal load capacity
  • by the corresponding shaft fitting — significantly increased axial load capacity

The mounting types by means of adapter sleeve and grub screws allow comparatively high axial loads of the bearing insert, whereas the type of shaft fitting allows a significantly increased axial load capacity.

Attachment with adapter sleeves

Adapter sleeves are used if the radial bearing has a tapered bore. Through the associated groove nut the insert bearing is fixed on the shaft. You will find corresponding articles here.
spannhülsen-befestigung
Adapter sleeve with tab washer and a locknut

Attachment with grub screws

The attachment with grub screws is done by allen screws, which are screwed onto the shaft. The set screws are either in a widened inner ring or an eccentric collar. You will find corresponding articles here (extended inner ring) and here (eccentric collar).

gewindestifte-befestigung
Grub screws in an extended inner ring
exzenter-befestigung
Grub screw in eccentric collar

The fastening types by means of adapter sleeves and grub screws with extended inner ring or eccentric collar allow comparable axial loads.

It must be ensured that the specified tightening torques are observed during assembly. A list of the recommended tightening torques can be found here.

Attachment by shaft fitting

Another option is the attachment through the shaft fitting. Here, the bearing insert is fixed by the fit on the shaft. In this type of fastening, the inner ring of the bearing insert can be set against a shaft shoulder and fixed with a lock nut and tab washer. In this case, the axial load capacity of the bearing insert can be fully utilized and is significantly higher than in the fastening types grub screws and adapter sleeve. Shock loads or vibrations can also be absorbed.

You will find corresponding articles here.

wellenpassung-befestigung
Shaft fitting on offset shaft with lock washer and locknut

Housing materials

Radial insert ball bearings are used in a bearing housing. The choice of the housing or the material used has an effect on the axial load capacity of the bearing insert. Housings made of sheet steel are only suitable for low axial loads. Cast iron housings are ideal if higher and variable axial loads generally occur.

Additional information

Other influencing factors

The axial load capacity of the bearing insert can be influenced by additional factors. These are e.g. the size of the shaft diameter or the bearing insert and the degree of hardness of the shaft used.

Don’t hesitate to contact us via our contact form if you have any further questions.

Mounting type floating bearing screw

Another type of attachment is the use of a floating bearing screw or trunnion screw. This sits in a recess or groove of the shaft and allows axial displacement. This type of fastening is therefore also suitable for applications in which long linear expansions due to temperature fluctuations are to be expected.

Split plummer block housings made of gray cast iron

At very high loads, the use of spherical roller bearings is recommended. These are used in split plummer block housings. Corresponding articles can be found under the following links: