Four Point Contact B. SKF QJ222 N2MA

The SKF QJ222 N2MA four-point bearing, with dimensions of 110 × 200 × 38 mm and a split inner ring, provides precise axial guidance in both directions.

The QJ222 N2MA four-point bearing is a rolling bearing in the SKF Explorer performance class. It primarily accommodates axial forces in both directions and requires only a small amount of axial installation space. The design features a split inner ring and a guided brass cage. As it is an open bearing, the lubricant can be selected to suit the specific operating environment. With standard radial clearance and increased precision, the component operates within a temperature range of -30 to +150 degrees.

In which applications is the QJ222 N2MA four-point bearing used?

The bearing is primarily used where varying axial loads need to be accommodated within limited axial installation space. The four-point bearing is often used as a pure axial bearing in combination with a separate radial bearing. In such bearing arrangements, it supports the shaft in both axial directions. Thanks to its SKF Explorer design, the bearing features optimised contact geometries of the raceways.

What are the advantages of a split inner ring and retaining grooves?

The two-piece inner ring allows for the accommodation of a large number of rolling elements, which increases the axial load capacity. Furthermore, the separable design simplifies assembly, as the outer ring together with the ball cage and the inner ring halves can be fitted separately. Two retaining grooves in the outer ring, offset by 180 degrees, serve to secure the outer ring against rotation in the housing using suitable retaining elements. Dimensional accuracy to tolerance class P6 and running accuracy to P5 contribute to low-vibration operation.