Date: 2013-08-01

Preadjustable Non-locating Bearing Unit

Preadjustable Non-locating Bearing Unit

In the area of high-precision non-locating bearings, there are numerous applications where the non-locating bearing of the shaft must have a specific internal clearance/preload in operation. In such applications, great value is placed on a precisely defined shaft position. In addition, there is an optimal operating condition for each bearing that represents a compromise between service life, rigidity and heat generation in the bearing.

Today, these application demands have more or less satisfactory bearing solutions. They include cylindrical roller bearings with a cylindrical or a tapered bore and needle roller bearing with a cylindrical bore.

In the case of a cylindrical roller bearing with a cylindrical bore, a design with a suitable interference fit, as well as an appropriate selection of the internal clearance before mounting, can greatly affect the operating clearance of the bearing.

However, a certain tolerance of the internal clearance remains that cannot be affected. In addition, a certain internal clearance is required before mounting, since mounting a cylindrical roller bearing with preload carries the risk of damaging the raceways before the bearing is used.

For a cylindrical roller bearing with a tapered bore, pushing on the inner ring and thus expanding the inner ring raceway can adjust the internal clearance/preload precisely.

This procedure is the standard solution in precision bearing technology (for example, machine tool spindles). However, it has disadvantages in that manufacturing tapered shafts is cost-intensive and the adjustment procedure is cumbersome.

For needle roller bearings with a cylindrical bore, a precise internal clearance/preload can be set very accurately by selecting the correctly dimensioned needle roller and cage assembly, i.e., a specific needle diameter.

This pairing procedure, however, is time-consuming and involves a certain risk. It is also cost-intensive, because of the stocks required.

These shortcomings have led SKF development engineers to create a new solution: the SKF Panloc non-locating bearing unit.

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