IBC High precision bearing units

IBC recommends ready-to-mount precision bearing units for fast and uncomplicated installation. The main application area of the bearing units that are lubricated for life and have labyrinth seals are ball screw drives on machine tools. A wide variety of arrangements in the rolling bearing set, which meet the most diverse requirements with regard to high axial rigidity and load rating, low frictional torque, high running accuracy and the accommodation of high speeds and accelerations, have resulted in a variable modular system that offers designers great flexibility, e.g. in the design of alternative versions.

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Some precision bearing housings of the same installation space are available with 60° axial angular contact ball bearings with different bore diameters. In the case of machine tools with different axis lengths, this has proven to be advantageous in that a larger ball screw diameter must be selected for larger strokes if the critical bending speed limit of the spindle is exceeded. Rolling bearings with different bores and otherwise the same component dimensions allow users to cost-effectively standardize the environment.

Today, ready-to-assemble precision bearing units are very much in vogue. The assembly of matching subassemblies simplifies and speeds up the assembly process, resulting in optimized cost effectiveness. The elimination of the axial contact surface in the locating bores contributes to the simplification of the adjacent components.

A distinction must be made between precision flanged bearing units and precision pillow block units. IBC high precision flanged bearing units have flat surfaces in both sides which results in a low overall height. This has an advantageous effect on the design and distinguishes them for easy handling during assembly.

The flanged bearing units can be mounted on a milled mounting surface in two different ways. They can either be inserted precisely into a calibrated bore and screwed in place, or they can be screwed on frictionally in an oversized bore in order to align them radially during assembly.

In the event of servicing, the on-site fitters also appreciate the ease with which a subassembly (bearing unit + ball screw) can be replaced. Likewise, a preassembled subassembly is quickly reinstalled, which reduces both maintenance times and downtimes.

In the BSBU-M series, the pre-fitted integrated locknut with matched labyrinth seal ensures simple and safe preloading of the precision flanged bearing unit.

Whereas in the past flanged bearing units had to be held by supports, the IBC high-precision pillow block bearing units bring savings in installation space and assembly time. The close-tolerance contact surfaces of the fixed and floating bearing units of the BSPB, BSPB-M and BLPB series, which have the same reference dimensions, have proved particularly advantageous. The contact edge for the precision bearing units can thus be machined with those of the guideways. Pre-drilled pin holes allow precise fixing. In addition, IBC offers IBC high precision bearing units with adapters for the ball screw nuts (according to DIN 69051). They are used particularly for long ball screws. The IBC standard designs cover practically all applications and serve as a basis for customer-specific special solutions.