Englisch
DeutschAxial 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
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).
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.
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.
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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: