New shaft-mounting concept

SKF have developed ConCentra, a locking technology for roller bearing units and other components designed to be mounted on a shaft. The locking method combines simplicity with reliability and minimizes the potential for incorrect fitting.

SKF say that when using ConCentra products the selection of high-precision shafts is not necessary as the use of cheaper shafts is possible, while still delivering the same operational quality. An intelligent Allen key with a built-in torque indicator is supplied with each unit to allow ConCentra to be assembled quickly with a predetermined torque.

ConCentra technology is based on a thin-walled sleeve which has a saw-tooth profile. In order for the locking function to work, it is necessary for there to be a corresponding profile in the bearing bore or in the component which is to be attached to the shaft. When the two sets of teeth mesh together, the locking function is achieved.

The saw-tooth profile has allowed SKF to make the sleeve so thin-walled that the products can be fitted according to the original boundary dimensions — a so-called ‘drop-in’ replacement. This also gives downsizing possibilities to OEM customers, as competing sleeve designs usually require a higher dimensioned size to complete the fitting.

Initially, two SKF ConCentra units will be available — a roller bearing unit, fitted with SKF’s Explorer bearing, and a ball-bearing unit with a slightly spherical capacity. For most applications, both units can be regarded as being lubricated for life.