Four Point Contact B. FAG QJ314 -MPA

The QJ314-MPA four-point bearing from FAG Rolling Bearings, with a 70 mm bore, accommodates high axial loads in both directions within a compact installation space.

The QJ314-MPA four-point bearing is a special radial ball bearing whose raceway geometry accommodates axial loads in both directions. Designed as an open bearing, the construction – with an outer diameter of 150 mm and a width of 35 mm – offers a compact solution for shaft mountings with very limited installation space. This component from FAG Rolling Bearings complies with tolerance class P0/PN or ABEC 1 and operates with standard radial clearance.

When is the QJ314-MPA four-point bearing with a split inner ring used?

This bearing type is primarily suitable for applications where axial forces from two directions need to be accommodated and where double-row angular contact ball bearings would require too much axial installation space. In such designs, the bearing often functions purely as an axial bearing alongside a separate radial bearing. As there are no retaining grooves in the outer ring, the outer ring rests evenly against the housing, whilst the guided brass cage is designed to withstand demanding mechanical loads.

What is the function of the split inner ring in a four-point bearing?

The design with a split inner ring allows a greater number of rolling elements to be incorporated, which specifically enhances the axial load-carrying capacity. The components are not self-retaining: The outer ring, including the ball race, and the two inner ring halves can be fitted separately onto the shaft and housing. As the design remains open, the type of lubricant and relubrication intervals can be flexibly adapted to the respective operating conditions within a temperature range of -30 to +150 degrees.